work around sequential schedule validation limit (#2655)

* remove readalltext

* remove unused method

* remove fileexists

* remove folderexists

* remove readalllines

* remove fake local file system

* show playlist name in playout build errors

* add basic sequential schedule validator tests

* work around sequential schedule validation limit

CHANGELOG.md

@@ -84,6 +84,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Add disabled text color and `(D)` and `(H)` labels for disabled and hidden channels in channel list
 - Graphics engine: fix subtitle path escaping and font loading
 - Fix corrupt output (green artifacts) when decoding certain 10-bit content using AMD Polaris GPUs
+- Work around sequential schedule validation limit (1000/hr by Newtonsoft.Json.Schema library)
+  - Playout builds now use JsonSchema.Net library which has no validation limit
+  - Validation tool in the UI still uses Newtonsoft.Json.Schema (with 1000/hr limit) as the error output is easier to understand
 
 ### Changed
 - Classic schedules: `Refresh` classic playouts from playout list; do not `Reset` them

ErsatzTV.Application/Channels/Commands/DeleteChannelHandler.cs

@@ -1,6 +1,6 @@
+using System.IO.Abstractions;
 using System.Threading.Channels;
 using ErsatzTV.Core;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Search;
 using ErsatzTV.Infrastructure.Data;
 using ErsatzTV.Infrastructure.Extensions;
@@ -12,19 +12,19 @@ namespace ErsatzTV.Application.Channels;
 public class DeleteChannelHandler : IRequestHandler<DeleteChannel, Either<BaseError, Unit>>
 {
     private readonly IDbContextFactory<TvContext> _dbContextFactory;
-    private readonly ILocalFileSystem _localFileSystem;
+    private readonly IFileSystem _fileSystem;
     private readonly ISearchTargets _searchTargets;
     private readonly ChannelWriter<IBackgroundServiceRequest> _workerChannel;
 
     public DeleteChannelHandler(
         ChannelWriter<IBackgroundServiceRequest> workerChannel,
         IDbContextFactory<TvContext> dbContextFactory,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ISearchTargets searchTargets)
     {
         _workerChannel = workerChannel;
         _dbContextFactory = dbContextFactory;
-        _localFileSystem = localFileSystem;
+        _fileSystem = fileSystem;
         _searchTargets = searchTargets;
     }
 
@@ -44,7 +44,7 @@ public class DeleteChannelHandler : IRequestHandler<DeleteChannel, Either<BaseEr
 
         // delete channel data from channel guide cache
         string cacheFile = Path.Combine(FileSystemLayout.ChannelGuideCacheFolder, $"{channel.Number}.xml");
-        if (_localFileSystem.FileExists(cacheFile))
+        if (_fileSystem.File.Exists(cacheFile))
         {
             File.Delete(cacheFile);
         }

ErsatzTV.Application/Channels/Commands/RefreshChannelDataHandler.cs

@@ -1,4 +1,5 @@
 using System.Globalization;
+using System.IO.Abstractions;
 using System.Xml;
 using ErsatzTV.Application.Configuration;
 using ErsatzTV.Core;
@@ -26,6 +27,7 @@ public class RefreshChannelDataHandler : IRequestHandler<RefreshChannelData>
 {
     private readonly IConfigElementRepository _configElementRepository;
     private readonly IDbContextFactory<TvContext> _dbContextFactory;
+    private readonly IFileSystem _fileSystem;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILogger<RefreshChannelDataHandler> _logger;
     private readonly RecyclableMemoryStreamManager _recyclableMemoryStreamManager;
@@ -33,12 +35,14 @@ public class RefreshChannelDataHandler : IRequestHandler<RefreshChannelData>
     public RefreshChannelDataHandler(
         RecyclableMemoryStreamManager recyclableMemoryStreamManager,
         IDbContextFactory<TvContext> dbContextFactory,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         IConfigElementRepository configElementRepository,
         ILogger<RefreshChannelDataHandler> logger)
     {
         _recyclableMemoryStreamManager = recyclableMemoryStreamManager;
         _dbContextFactory = dbContextFactory;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _configElementRepository = configElementRepository;
         _logger = logger;
@@ -886,7 +890,7 @@ public class RefreshChannelDataHandler : IRequestHandler<RefreshChannelData>
             "movie.sbntxt");
 
         // fail if file doesn't exist
-        if (!_localFileSystem.FileExists(templateFileName))
+        if (!_fileSystem.File.Exists(templateFileName))
         {
             _logger.LogError(
                 "Unable to generate movie XMLTV fragment without template file {File}; please restart ErsatzTV",
@@ -905,7 +909,7 @@ public class RefreshChannelDataHandler : IRequestHandler<RefreshChannelData>
             "episode.sbntxt");
 
         // fail if file doesn't exist
-        if (!_localFileSystem.FileExists(templateFileName))
+        if (!_fileSystem.File.Exists(templateFileName))
         {
             _logger.LogError(
                 "Unable to generate episode XMLTV fragment without template file {File}; please restart ErsatzTV",
@@ -924,7 +928,7 @@ public class RefreshChannelDataHandler : IRequestHandler<RefreshChannelData>
             "musicVideo.sbntxt");
 
         // fail if file doesn't exist
-        if (!_localFileSystem.FileExists(templateFileName))
+        if (!_fileSystem.File.Exists(templateFileName))
         {
             _logger.LogError(
                 "Unable to generate music video XMLTV fragment without template file {File}; please restart ErsatzTV",
@@ -943,7 +947,7 @@ public class RefreshChannelDataHandler : IRequestHandler<RefreshChannelData>
             "song.sbntxt");
 
         // fail if file doesn't exist
-        if (!_localFileSystem.FileExists(templateFileName))
+        if (!_fileSystem.File.Exists(templateFileName))
         {
             _logger.LogError(
                 "Unable to generate song XMLTV fragment without template file {File}; please restart ErsatzTV",
@@ -962,7 +966,7 @@ public class RefreshChannelDataHandler : IRequestHandler<RefreshChannelData>
             "otherVideo.sbntxt");
 
         // fail if file doesn't exist
-        if (!_localFileSystem.FileExists(templateFileName))
+        if (!_fileSystem.File.Exists(templateFileName))
         {
             _logger.LogError(
                 "Unable to generate other video XMLTV fragment without template file {File}; please restart ErsatzTV",
@@ -1077,7 +1081,7 @@ public class RefreshChannelDataHandler : IRequestHandler<RefreshChannelData>
     {
         var result = new List<PlayoutItem>();
 
-        if (_localFileSystem.FileExists(path))
+        if (_fileSystem.File.Exists(path))
         {
             Option<ExternalJsonChannel> maybeChannel = JsonConvert.DeserializeObject<ExternalJsonChannel>(
                 await File.ReadAllTextAsync(path));

ErsatzTV.Application/Channels/Commands/RefreshChannelListHandler.cs

@@ -1,4 +1,5 @@
 using System.Data.Common;
+using System.IO.Abstractions;
 using System.Net;
 using System.Xml;
 using Dapper;
@@ -19,6 +20,7 @@ namespace ErsatzTV.Application.Channels;
 public class RefreshChannelListHandler : IRequestHandler<RefreshChannelList>
 {
     private readonly IDbContextFactory<TvContext> _dbContextFactory;
+    private readonly IFileSystem _fileSystem;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILogger<RefreshChannelListHandler> _logger;
     private readonly RecyclableMemoryStreamManager _recyclableMemoryStreamManager;
@@ -26,11 +28,13 @@ public class RefreshChannelListHandler : IRequestHandler<RefreshChannelList>
     public RefreshChannelListHandler(
         RecyclableMemoryStreamManager recyclableMemoryStreamManager,
         IDbContextFactory<TvContext> dbContextFactory,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         ILogger<RefreshChannelListHandler> logger)
     {
         _recyclableMemoryStreamManager = recyclableMemoryStreamManager;
         _dbContextFactory = dbContextFactory;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _logger = logger;
     }
@@ -44,13 +48,13 @@ public class RefreshChannelListHandler : IRequestHandler<RefreshChannelList>
         string templateFileName = Path.Combine(FileSystemLayout.ChannelGuideTemplatesFolder, "channel.sbntxt");
 
         // fall back to default template
-        if (!_localFileSystem.FileExists(templateFileName))
+        if (!_fileSystem.File.Exists(templateFileName))
         {
             templateFileName = Path.Combine(FileSystemLayout.ChannelGuideTemplatesFolder, "_channel.sbntxt");
         }
 
         // fail if file doesn't exist
-        if (!_localFileSystem.FileExists(templateFileName))
+        if (!_fileSystem.File.Exists(templateFileName))
         {
             _logger.LogError(
                 "Unable to generate channel list without template file {File}; please restart ErsatzTV",

ErsatzTV.Application/Channels/Queries/GetChannelGuideHandler.cs

@@ -1,4 +1,5 @@
 using System.Collections.Immutable;
+using System.IO.Abstractions;
 using System.Text;
 using System.Text.RegularExpressions;
 using ErsatzTV.Core;
@@ -15,14 +16,17 @@ public partial class GetChannelGuideHandler : IRequestHandler<GetChannelGuide, E
     private readonly IDbContextFactory<TvContext> _dbContextFactory;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly RecyclableMemoryStreamManager _recyclableMemoryStreamManager;
+    private readonly IFileSystem _fileSystem;
 
     public GetChannelGuideHandler(
         IDbContextFactory<TvContext> dbContextFactory,
         RecyclableMemoryStreamManager recyclableMemoryStreamManager,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem)
     {
         _dbContextFactory = dbContextFactory;
         _recyclableMemoryStreamManager = recyclableMemoryStreamManager;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
     }
 
@@ -39,7 +43,7 @@ public partial class GetChannelGuideHandler : IRequestHandler<GetChannelGuide, E
             .ToImmutableHashSet();
 
         string channelsFile = Path.Combine(FileSystemLayout.ChannelGuideCacheFolder, "channels.xml");
-        if (!_localFileSystem.FileExists(channelsFile))
+        if (!_fileSystem.File.Exists(channelsFile))
         {
             return BaseError.New($"Required file {channelsFile} is missing");
         }

ErsatzTV.Application/FFmpegProfiles/Commands/UpdateFFmpegSettingsHandler.cs

@@ -1,18 +1,18 @@
 using System.Diagnostics;
 using System.Globalization;
+using System.IO.Abstractions;
 using System.Threading.Channels;
 using ErsatzTV.Application.FFmpeg;
 using ErsatzTV.Application.Subtitles;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 
 namespace ErsatzTV.Application.FFmpegProfiles;
 
 public class UpdateFFmpegSettingsHandler(
     IConfigElementRepository configElementRepository,
-    ILocalFileSystem localFileSystem,
+    IFileSystem fileSystem,
     ChannelWriter<IBackgroundServiceRequest> workerChannel)
     : IRequestHandler<UpdateFFmpegSettings, Either<BaseError, Unit>>
 {
@@ -35,7 +35,7 @@ public class UpdateFFmpegSettingsHandler(
 
     private async Task<Validation<BaseError, Unit>> ValidateToolPath(string path, string name)
     {
-        if (!localFileSystem.FileExists(path))
+        if (!fileSystem.File.Exists(path))
         {
             return BaseError.New($"{name} path does not exist");
         }

ErsatzTV.Application/Graphics/Commands/RefreshGraphicsElementsHandler.cs

@@ -1,3 +1,4 @@
+using System.IO.Abstractions;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Metadata;
@@ -10,6 +11,7 @@ namespace ErsatzTV.Application.Graphics;
 
 public class RefreshGraphicsElementsHandler(
     IDbContextFactory<TvContext> dbContextFactory,
+    IFileSystem fileSystem,
     ILocalFileSystem localFileSystem,
     IGraphicsElementLoader graphicsElementLoader,
     ILogger<RefreshGraphicsElementsHandler> logger)
@@ -24,7 +26,7 @@ public class RefreshGraphicsElementsHandler(
             .ToListAsync(cancellationToken);
 
         var missing = allExisting
-            .Where(e => !localFileSystem.FileExists(e.Path) || (Path.GetExtension(e.Path) != ".yml" && Path.GetExtension(e.Path) != ".yaml"))
+            .Where(e => !fileSystem.File.Exists(e.Path) || (Path.GetExtension(e.Path) != ".yml" && Path.GetExtension(e.Path) != ".yaml"))
             .ToList();
 
         foreach (GraphicsElement existing in missing)

ErsatzTV.Application/Playouts/Commands/CreateExternalJsonPlayoutHandler.cs

@@ -1,8 +1,8 @@
+using System.IO.Abstractions;
 using System.Threading.Channels;
 using ErsatzTV.Application.Channels;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Scheduling;
 using ErsatzTV.Infrastructure.Data;
 using ErsatzTV.Infrastructure.Extensions;
@@ -14,16 +14,16 @@ namespace ErsatzTV.Application.Playouts;
 public class CreateExternalJsonPlayoutHandler
     : IRequestHandler<CreateExternalJsonPlayout, Either<BaseError, CreatePlayoutResponse>>
 {
+    private readonly IFileSystem _fileSystem;
     private readonly ChannelWriter<IBackgroundServiceRequest> _channel;
     private readonly IDbContextFactory<TvContext> _dbContextFactory;
-    private readonly ILocalFileSystem _localFileSystem;
 
     public CreateExternalJsonPlayoutHandler(
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ChannelWriter<IBackgroundServiceRequest> channel,
         IDbContextFactory<TvContext> dbContextFactory)
     {
-        _localFileSystem = localFileSystem;
+        _fileSystem = fileSystem;
         _channel = channel;
         _dbContextFactory = dbContextFactory;
     }
@@ -76,7 +76,7 @@ public class CreateExternalJsonPlayoutHandler
 
     private Validation<BaseError, string> ValidateExternalJsonFile(CreateExternalJsonPlayout request)
     {
-        if (!_localFileSystem.FileExists(request.ScheduleFile))
+        if (!_fileSystem.File.Exists(request.ScheduleFile))
         {
             return BaseError.New("External Json File does not exist!");
         }

ErsatzTV.Application/Playouts/Commands/CreateScriptedPlayoutHandler.cs

@@ -1,4 +1,5 @@
 using System.CommandLine.Parsing;
+using System.IO.Abstractions;
 using System.Threading.Channels;
 using ErsatzTV.Application.Channels;
 using ErsatzTV.Core;
@@ -12,28 +13,17 @@ using Channel = ErsatzTV.Core.Domain.Channel;
 
 namespace ErsatzTV.Application.Playouts;
 
-public class CreateScriptedPlayoutHandler
+public class CreateScriptedPlayoutHandler(
+    IFileSystem fileSystem,
+    ChannelWriter<IBackgroundServiceRequest> channel,
+    IDbContextFactory<TvContext> dbContextFactory)
     : IRequestHandler<CreateScriptedPlayout, Either<BaseError, CreatePlayoutResponse>>
 {
-    private readonly ChannelWriter<IBackgroundServiceRequest> _channel;
-    private readonly IDbContextFactory<TvContext> _dbContextFactory;
-    private readonly ILocalFileSystem _localFileSystem;
-
-    public CreateScriptedPlayoutHandler(
-        ILocalFileSystem localFileSystem,
-        ChannelWriter<IBackgroundServiceRequest> channel,
-        IDbContextFactory<TvContext> dbContextFactory)
-    {
-        _localFileSystem = localFileSystem;
-        _channel = channel;
-        _dbContextFactory = dbContextFactory;
-    }
-
     public async Task<Either<BaseError, CreatePlayoutResponse>> Handle(
         CreateScriptedPlayout request,
         CancellationToken cancellationToken)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync(cancellationToken);
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync(cancellationToken);
         Validation<BaseError, Playout> validation = await Validate(dbContext, request, cancellationToken);
         return await validation.Apply(playout => PersistPlayout(dbContext, playout, cancellationToken));
     }
@@ -45,15 +35,15 @@ public class CreateScriptedPlayoutHandler
     {
         await dbContext.Playouts.AddAsync(playout, cancellationToken);
         await dbContext.SaveChangesAsync(cancellationToken);
-        await _channel.WriteAsync(new BuildPlayout(playout.Id, PlayoutBuildMode.Reset), cancellationToken);
+        await channel.WriteAsync(new BuildPlayout(playout.Id, PlayoutBuildMode.Reset), cancellationToken);
         if (playout.Channel.PlayoutMode is ChannelPlayoutMode.OnDemand)
         {
-            await _channel.WriteAsync(
+            await channel.WriteAsync(
                 new TimeShiftOnDemandPlayout(playout.Id, DateTimeOffset.Now, false),
                 cancellationToken);
         }
 
-        await _channel.WriteAsync(new RefreshChannelList(), cancellationToken);
+        await channel.WriteAsync(new RefreshChannelList(), cancellationToken);
         return new CreatePlayoutResponse(playout.Id);
     }
 
@@ -91,7 +81,7 @@ public class CreateScriptedPlayoutHandler
     {
         var args = CommandLineParser.SplitCommandLine(request.ScheduleFile).ToList();
         string scriptFile = args[0];
-        if (!_localFileSystem.FileExists(scriptFile))
+        if (!fileSystem.File.Exists(scriptFile))
         {
             return BaseError.New("Scripted schedule does not exist!");
         }

ErsatzTV.Application/Playouts/Commands/CreateSequentialPlayoutHandler.cs

@@ -1,8 +1,8 @@
+using System.IO.Abstractions;
 using System.Threading.Channels;
 using ErsatzTV.Application.Channels;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Scheduling;
 using ErsatzTV.Infrastructure.Data;
 using ErsatzTV.Infrastructure.Extensions;
@@ -11,28 +11,17 @@ using Channel = ErsatzTV.Core.Domain.Channel;
 
 namespace ErsatzTV.Application.Playouts;
 
-public class CreateSequentialPlayoutHandler
+public class CreateSequentialPlayoutHandler(
+    IFileSystem fileSystem,
+    ChannelWriter<IBackgroundServiceRequest> channel,
+    IDbContextFactory<TvContext> dbContextFactory)
     : IRequestHandler<CreateSequentialPlayout, Either<BaseError, CreatePlayoutResponse>>
 {
-    private readonly ChannelWriter<IBackgroundServiceRequest> _channel;
-    private readonly IDbContextFactory<TvContext> _dbContextFactory;
-    private readonly ILocalFileSystem _localFileSystem;
-
-    public CreateSequentialPlayoutHandler(
-        ILocalFileSystem localFileSystem,
-        ChannelWriter<IBackgroundServiceRequest> channel,
-        IDbContextFactory<TvContext> dbContextFactory)
-    {
-        _localFileSystem = localFileSystem;
-        _channel = channel;
-        _dbContextFactory = dbContextFactory;
-    }
-
     public async Task<Either<BaseError, CreatePlayoutResponse>> Handle(
         CreateSequentialPlayout request,
         CancellationToken cancellationToken)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync(cancellationToken);
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync(cancellationToken);
         Validation<BaseError, Playout> validation = await Validate(dbContext, request, cancellationToken);
         return await validation.Apply(playout => PersistPlayout(dbContext, playout, cancellationToken));
     }
@@ -44,15 +33,15 @@ public class CreateSequentialPlayoutHandler
     {
         await dbContext.Playouts.AddAsync(playout, cancellationToken);
         await dbContext.SaveChangesAsync(cancellationToken);
-        await _channel.WriteAsync(new BuildPlayout(playout.Id, PlayoutBuildMode.Reset), cancellationToken);
+        await channel.WriteAsync(new BuildPlayout(playout.Id, PlayoutBuildMode.Reset), cancellationToken);
         if (playout.Channel.PlayoutMode is ChannelPlayoutMode.OnDemand)
         {
-            await _channel.WriteAsync(
+            await channel.WriteAsync(
                 new TimeShiftOnDemandPlayout(playout.Id, DateTimeOffset.Now, false),
                 cancellationToken);
         }
 
-        await _channel.WriteAsync(new RefreshChannelList(), cancellationToken);
+        await channel.WriteAsync(new RefreshChannelList(), cancellationToken);
         return new CreatePlayoutResponse(playout.Id);
     }
 
@@ -87,7 +76,7 @@ public class CreateSequentialPlayoutHandler
 
     private Validation<BaseError, string> ValidateYamlFile(CreateSequentialPlayout request)
     {
-        if (!_localFileSystem.FileExists(request.ScheduleFile))
+        if (!fileSystem.File.Exists(request.ScheduleFile))
         {
             return BaseError.New("Sequential schedule does not exist!");
         }

ErsatzTV.Application/Playouts/Commands/DeletePlayoutHandler.cs

@@ -1,8 +1,8 @@
-using System.Threading.Channels;
+using System.IO.Abstractions;
+using System.Threading.Channels;
 using ErsatzTV.Application.Channels;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Notifications;
 using ErsatzTV.Infrastructure.Data;
 using ErsatzTV.Infrastructure.Extensions;
@@ -10,28 +10,16 @@ using Microsoft.EntityFrameworkCore;
 
 namespace ErsatzTV.Application.Playouts;
 
-public class DeletePlayoutHandler : IRequestHandler<DeletePlayout, Either<BaseError, Unit>>
+public class DeletePlayoutHandler(
+    ChannelWriter<IBackgroundServiceRequest> workerChannel,
+    IDbContextFactory<TvContext> dbContextFactory,
+    IFileSystem fileSystem,
+    IMediator mediator)
+    : IRequestHandler<DeletePlayout, Either<BaseError, Unit>>
 {
-    private readonly IDbContextFactory<TvContext> _dbContextFactory;
-    private readonly ILocalFileSystem _localFileSystem;
-    private readonly IMediator _mediator;
-    private readonly ChannelWriter<IBackgroundServiceRequest> _workerChannel;
-
-    public DeletePlayoutHandler(
-        ChannelWriter<IBackgroundServiceRequest> workerChannel,
-        IDbContextFactory<TvContext> dbContextFactory,
-        ILocalFileSystem localFileSystem,
-        IMediator mediator)
-    {
-        _workerChannel = workerChannel;
-        _dbContextFactory = dbContextFactory;
-        _localFileSystem = localFileSystem;
-        _mediator = mediator;
-    }
-
     public async Task<Either<BaseError, Unit>> Handle(DeletePlayout request, CancellationToken cancellationToken)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync(cancellationToken);
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync(cancellationToken);
 
         Option<Playout> maybePlayout = await dbContext.Playouts
             .Include(p => p.Channel)
@@ -44,15 +32,15 @@ public class DeletePlayoutHandler : IRequestHandler<DeletePlayout, Either<BaseEr
 
             // delete channel data from channel guide cache
             string cacheFile = Path.Combine(FileSystemLayout.ChannelGuideCacheFolder, $"{playout.Channel.Number}.xml");
-            if (_localFileSystem.FileExists(cacheFile))
+            if (fileSystem.File.Exists(cacheFile))
             {
                 File.Delete(cacheFile);
             }
 
             // refresh channel list to remove channel that has no playout
-            await _workerChannel.WriteAsync(new RefreshChannelList(), cancellationToken);
+            await workerChannel.WriteAsync(new RefreshChannelList(), cancellationToken);
 
-            await _mediator.Publish(new PlayoutUpdatedNotification(playout.Id, false), cancellationToken);
+            await mediator.Publish(new PlayoutUpdatedNotification(playout.Id, false), cancellationToken);
         }
 
         return maybePlayout

ErsatzTV.Application/Playouts/Commands/UpdateScriptedPlayoutHandler.cs

@@ -1,9 +1,9 @@
 using System.CommandLine.Parsing;
+using System.IO.Abstractions;
 using System.Threading.Channels;
 using ErsatzTV.Application.Channels;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Infrastructure.Data;
 using ErsatzTV.Infrastructure.Extensions;
 using Microsoft.EntityFrameworkCore;
@@ -14,7 +14,7 @@ public class
     UpdateScriptedPlayoutHandler(
         IDbContextFactory<TvContext> dbContextFactory,
         ChannelWriter<IBackgroundServiceRequest> workerChannel,
-        ILocalFileSystem localFileSystem)
+        IFileSystem fileSystem)
     : IRequestHandler<UpdateScriptedPlayout,
         Either<BaseError, PlayoutNameViewModel>>
 {
@@ -63,7 +63,7 @@ public class
     {
         var args = CommandLineParser.SplitCommandLine(request.ScheduleFile).ToList();
         string scriptFile = args[0];
-        if (!localFileSystem.FileExists(scriptFile))
+        if (!fileSystem.File.Exists(scriptFile))
         {
             return BaseError.New("Scripted schedule does not exist!");
         }

ErsatzTV.Application/Streaming/Commands/StartFFmpegSessionHandler.cs

@@ -1,4 +1,5 @@
-using System.Threading.Channels;
+using System.IO.Abstractions;
+using System.Threading.Channels;
 using Bugsnag;
 using ErsatzTV.Application.Channels;
 using ErsatzTV.Application.Graphics;
@@ -21,6 +22,7 @@ namespace ErsatzTV.Application.Streaming;
 public class StartFFmpegSessionHandler : IRequestHandler<StartFFmpegSession, Either<BaseError, Unit>>
 {
     private readonly IClient _client;
+    private readonly IFileSystem _fileSystem;
     private readonly IConfigElementRepository _configElementRepository;
     private readonly IFFmpegSegmenterService _ffmpegSegmenterService;
     private readonly IGraphicsEngine _graphicsEngine;
@@ -40,6 +42,7 @@ public class StartFFmpegSessionHandler : IRequestHandler<StartFFmpegSession, Eit
         IServiceScopeFactory serviceScopeFactory,
         IMediator mediator,
         IClient client,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         ILogger<StartFFmpegSessionHandler> logger,
         ILogger<HlsSessionWorker> sessionWorkerLogger,
@@ -54,6 +57,7 @@ public class StartFFmpegSessionHandler : IRequestHandler<StartFFmpegSession, Eit
         _serviceScopeFactory = serviceScopeFactory;
         _mediator = mediator;
         _client = client;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _logger = logger;
         _sessionWorkerLogger = sessionWorkerLogger;
@@ -129,6 +133,7 @@ public class StartFFmpegSessionHandler : IRequestHandler<StartFFmpegSession, Eit
                 _hlsPlaylistFilter,
                 _hlsInitSegmentCache,
                 _configElementRepository,
+                _fileSystem,
                 _localFileSystem,
                 _sessionWorkerLogger,
                 targetFramerate)

ErsatzTV.Application/Streaming/HlsSessionWorker.cs

@@ -1,6 +1,7 @@
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
+using System.IO.Abstractions;
 using System.IO.Pipelines;
 using System.Text;
 using System.Timers;
@@ -30,6 +31,7 @@ public class HlsSessionWorker : IHlsSessionWorker
     private readonly IHlsInitSegmentCache _hlsInitSegmentCache;
     private readonly Dictionary<long, int> _discontinuityMap = [];
     private readonly IConfigElementRepository _configElementRepository;
+    private readonly IFileSystem _fileSystem;
     private readonly IGraphicsEngine _graphicsEngine;
     private readonly IHlsPlaylistFilter _hlsPlaylistFilter;
     private readonly ILocalFileSystem _localFileSystem;
@@ -60,6 +62,7 @@ public class HlsSessionWorker : IHlsSessionWorker
         IHlsPlaylistFilter hlsPlaylistFilter,
         IHlsInitSegmentCache hlsInitSegmentCache,
         IConfigElementRepository configElementRepository,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         ILogger<HlsSessionWorker> logger,
         Option<int> targetFramerate)
@@ -72,6 +75,7 @@ public class HlsSessionWorker : IHlsSessionWorker
         _hlsInitSegmentCache = hlsInitSegmentCache;
         _hlsPlaylistFilter = hlsPlaylistFilter;
         _configElementRepository = configElementRepository;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _logger = logger;
         _targetFramerate = targetFramerate;
@@ -308,7 +312,7 @@ public class HlsSessionWorker : IHlsSessionWorker
             string playlistFileName = Path.Combine(_workingDirectory, "live.m3u8");
 
             _logger.LogDebug("Waiting for playlist to exist");
-            while (!_localFileSystem.FileExists(playlistFileName))
+            while (!_fileSystem.File.Exists(playlistFileName))
             {
                 await Task.Delay(TimeSpan.FromMilliseconds(100), cancellationToken);
             }
@@ -679,9 +683,9 @@ public class HlsSessionWorker : IHlsSessionWorker
         var generatedAtHash = new System.Collections.Generic.HashSet<long>();
 
         // delete old segments
-        var allSegments = Directory.GetFiles(_workingDirectory, "live*.ts")
+        var allSegments = _fileSystem.Directory.GetFiles(_workingDirectory, "live*.ts")
-            .Append(Directory.GetFiles(_workingDirectory, "live*.mp4"))
+            .Append(_fileSystem.Directory.GetFiles(_workingDirectory, "live*.mp4"))
-            .Append(Directory.GetFiles(_workingDirectory, "live*.m4s"))
+            .Append(_fileSystem.Directory.GetFiles(_workingDirectory, "live*.m4s"))
             .Map(file =>
             {
                 string fileName = Path.GetFileName(file);
@@ -699,7 +703,7 @@ public class HlsSessionWorker : IHlsSessionWorker
             })
             .ToList();
 
-        var allInits = Directory.GetFiles(_workingDirectory, "*init.mp4")
+        var allInits = _fileSystem.Directory.GetFiles(_workingDirectory, "*init.mp4")
             .Map(file => long.TryParse(Path.GetFileName(file).Split('_')[0], out long generatedAt) && !generatedAtHash.Contains(generatedAt)
                 ? new Segment(file, 0, generatedAt)
                 : Option<Segment>.None)
@@ -739,7 +743,7 @@ public class HlsSessionWorker : IHlsSessionWorker
         {
             try
             {
-                File.Delete(segment.File);
+                _fileSystem.File.Delete(segment.File);
             }
             catch (IOException)
             {
@@ -752,12 +756,12 @@ public class HlsSessionWorker : IHlsSessionWorker
 
     private async Task RefreshInits()
     {
-        var allSegments = Directory.GetFiles(_workingDirectory, "live*.m4s")
+        var allSegments = _fileSystem.Directory.GetFiles(_workingDirectory, "live*.m4s")
             .Map(Path.GetFileName)
             .Map(s => s.Split("_")[1])
             .ToHashSet();
 
-        foreach (string file in Directory.GetFiles(_workingDirectory, "*init.mp4"))
+        foreach (string file in _fileSystem.Directory.GetFiles(_workingDirectory, "*init.mp4"))
         {
             string key = Path.GetFileName(file).Split("_")[0];
             if (allSegments.Contains(key))
@@ -812,9 +816,9 @@ public class HlsSessionWorker : IHlsSessionWorker
     private async Task<Option<string[]>> ReadPlaylistLines(CancellationToken cancellationToken)
     {
         string fileName = PlaylistFileName();
-        if (File.Exists(fileName))
+        if (_fileSystem.File.Exists(fileName))
         {
-            return await File.ReadAllLinesAsync(fileName, cancellationToken);
+            return await _fileSystem.File.ReadAllLinesAsync(fileName, cancellationToken);
         }
 
         _logger.LogDebug("Playlist does not exist at expected location {File}", fileName);
@@ -824,7 +828,7 @@ public class HlsSessionWorker : IHlsSessionWorker
     private async Task WritePlaylist(string playlist, CancellationToken cancellationToken)
     {
         string fileName = PlaylistFileName();
-        await File.WriteAllTextAsync(fileName, playlist, cancellationToken);
+        await _fileSystem.File.WriteAllTextAsync(fileName, playlist, cancellationToken);
     }
 
     private string PlaylistFileName() => Path.Combine(_workingDirectory, "live.m3u8");

ErsatzTV.Application/Streaming/Queries/GetLastPtsTimeHandler.cs

@@ -1,11 +1,11 @@
-using System.Text;
+using System.IO.Abstractions;
+using System.Text;
 using Bugsnag;
 using CliWrap;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.FFmpeg;
 using ErsatzTV.Core.Interfaces.FFmpeg;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using Microsoft.Extensions.Logging;
 using Newtonsoft.Json;
@@ -14,7 +14,7 @@ namespace ErsatzTV.Application.Streaming;
 
 public class GetLastPtsTimeHandler(
     IClient client,
-    ILocalFileSystem localFileSystem,
+    IFileSystem fileSystem,
     ITempFilePool tempFilePool,
     IConfigElementRepository configElementRepository,
     ILogger<GetLastPtsTimeHandler> logger)
@@ -168,7 +168,7 @@ public class GetLastPtsTimeHandler(
 
             string playlistFileName = Path.Combine(FileSystemLayout.TranscodeFolder, channelNumber, "live.m3u8");
             string playlistContents = string.Empty;
-            if (localFileSystem.FileExists(playlistFileName))
+            if (fileSystem.File.Exists(playlistFileName))
             {
                 playlistContents = await File.ReadAllTextAsync(playlistFileName);
             }

ErsatzTV.Application/Streaming/Queries/GetPlayoutItemProcessByChannelNumberHandler.cs

@@ -1,4 +1,5 @@
-using CliWrap;
+using System.IO.Abstractions;
+using CliWrap;
 using Dapper;
 using ErsatzTV.Application.Playouts;
 using ErsatzTV.Core;
@@ -31,6 +32,7 @@ public class GetPlayoutItemProcessByChannelNumberHandler : FFmpegProcessHandler<
     private readonly IEmbyPathReplacementService _embyPathReplacementService;
     private readonly IExternalJsonPlayoutItemProvider _externalJsonPlayoutItemProvider;
     private readonly IFFmpegProcessService _ffmpegProcessService;
+    private readonly IFileSystem _fileSystem;
     private readonly IJellyfinPathReplacementService _jellyfinPathReplacementService;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILogger<GetPlayoutItemProcessByChannelNumberHandler> _logger;
@@ -47,6 +49,7 @@ public class GetPlayoutItemProcessByChannelNumberHandler : FFmpegProcessHandler<
     public GetPlayoutItemProcessByChannelNumberHandler(
         IDbContextFactory<TvContext> dbContextFactory,
         IFFmpegProcessService ffmpegProcessService,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         IExternalJsonPlayoutItemProvider externalJsonPlayoutItemProvider,
         IPlexPathReplacementService plexPathReplacementService,
@@ -64,6 +67,7 @@ public class GetPlayoutItemProcessByChannelNumberHandler : FFmpegProcessHandler<
         : base(dbContextFactory)
     {
         _ffmpegProcessService = ffmpegProcessService;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _externalJsonPlayoutItemProvider = externalJsonPlayoutItemProvider;
         _plexPathReplacementService = plexPathReplacementService;
@@ -775,7 +779,7 @@ public class GetPlayoutItemProcessByChannelNumberHandler : FFmpegProcessHandler<
         }
 
         // check filesystem first
-        if (_localFileSystem.FileExists(path))
+        if (_fileSystem.File.Exists(path))
         {
             if (playoutItem.MediaItem is RemoteStream remoteStream)
             {

ErsatzTV.Application/Subtitles/Commands/ExtractEmbeddedShowSubtitlesHandler.cs

@@ -1,3 +1,4 @@
+using System.IO.Abstractions;
 using System.Threading.Channels;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Infrastructure.Data;
@@ -7,7 +8,6 @@ using Microsoft.Extensions.Logging;
 using Dapper;
 using ErsatzTV.Application.Maintenance;
 using ErsatzTV.Core;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 
 namespace ErsatzTV.Application.Subtitles;
@@ -16,9 +16,9 @@ public class ExtractEmbeddedShowSubtitlesHandler(
     IDbContextFactory<TvContext> dbContextFactory,
     ChannelWriter<IBackgroundServiceRequest> workerChannel,
     IConfigElementRepository configElementRepository,
-    ILocalFileSystem localFileSystem,
+    IFileSystem fileSystem,
     ILogger<ExtractEmbeddedSubtitlesHandler> logger)
-    : ExtractEmbeddedSubtitlesHandlerBase(localFileSystem, logger),
+    : ExtractEmbeddedSubtitlesHandlerBase(fileSystem, logger),
         IRequestHandler<ExtractEmbeddedShowSubtitles, Option<BaseError>>
 {
     public async Task<Option<BaseError>> Handle(

ErsatzTV.Application/Subtitles/Commands/ExtractEmbeddedSubtitlesHandler.cs

@@ -1,9 +1,9 @@
-using System.Threading.Channels;
+using System.IO.Abstractions;
+using System.Threading.Channels;
 using ErsatzTV.Application.Maintenance;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Locking;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Infrastructure.Data;
 using ErsatzTV.Infrastructure.Extensions;
@@ -23,12 +23,12 @@ public class ExtractEmbeddedSubtitlesHandler : ExtractEmbeddedSubtitlesHandlerBa
 
     public ExtractEmbeddedSubtitlesHandler(
         IDbContextFactory<TvContext> dbContextFactory,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         IEntityLocker entityLocker,
         IConfigElementRepository configElementRepository,
         ChannelWriter<IBackgroundServiceRequest> workerChannel,
         ILogger<ExtractEmbeddedSubtitlesHandler> logger)
-        : base(localFileSystem, logger)
+        : base(fileSystem, logger)
     {
         _dbContextFactory = dbContextFactory;
         _entityLocker = entityLocker;

ErsatzTV.Application/Subtitles/Commands/ExtractEmbeddedSubtitlesHandlerBase.cs

@@ -1,4 +1,5 @@
 using System.Diagnostics.CodeAnalysis;
+using System.IO.Abstractions;
 using System.Security.Cryptography;
 using System.Text;
 using CliWrap;
@@ -8,7 +9,6 @@ using Dapper;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Extensions;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Infrastructure.Data;
 using ErsatzTV.Infrastructure.Extensions;
 using Microsoft.EntityFrameworkCore;
@@ -17,7 +17,7 @@ using Microsoft.Extensions.Logging;
 namespace ErsatzTV.Application.Subtitles;
 
 [SuppressMessage("Security", "CA5351:Do Not Use Broken Cryptographic Algorithms")]
-public abstract class ExtractEmbeddedSubtitlesHandlerBase(ILocalFileSystem localFileSystem, ILogger logger)
+public abstract class ExtractEmbeddedSubtitlesHandlerBase(IFileSystem fileSystem, ILogger logger)
 {
     protected static Task<Validation<BaseError, string>> FFmpegPathMustExist(
         TvContext dbContext,
@@ -133,7 +133,7 @@ public abstract class ExtractEmbeddedSubtitlesHandlerBase(ILocalFileSystem local
                 {
                     string fullOutputPath = Path.Combine(FileSystemLayout.SubtitleCacheFolder, subtitle.OutputPath);
                     Directory.CreateDirectory(Path.GetDirectoryName(fullOutputPath));
-                    if (localFileSystem.FileExists(fullOutputPath))
+                    if (fileSystem.File.Exists(fullOutputPath))
                     {
                         File.Delete(fullOutputPath);
                     }
@@ -193,7 +193,7 @@ public abstract class ExtractEmbeddedSubtitlesHandlerBase(ILocalFileSystem local
                 }
 
                 string fullOutputPath = Path.Combine(FileSystemLayout.FontsCacheFolder, fontStream.FileName);
-                if (localFileSystem.FileExists(fullOutputPath))
+                if (fileSystem.File.Exists(fullOutputPath))
                 {
                     // already extracted
                     continue;
@@ -212,7 +212,7 @@ public abstract class ExtractEmbeddedSubtitlesHandlerBase(ILocalFileSystem local
 
                 // ffmpeg seems to return exit code 1 in all cases when dumping an attachment
                 // so ignore it and check success a different way
-                if (localFileSystem.FileExists(fullOutputPath))
+                if (fileSystem.File.Exists(fullOutputPath))
                 {
                     logger.LogDebug("Successfully extracted font {Font}", fontStream.FileName);
                 }
@@ -300,7 +300,7 @@ public abstract class ExtractEmbeddedSubtitlesHandlerBase(ILocalFileSystem local
     {
         foreach (string path in GetRelativeOutputPath(mediaItemId, subtitle))
         {
-            return !localFileSystem.FileExists(path);
+            return !fileSystem.File.Exists(path);
         }
 
         return false;

ErsatzTV.Application/Troubleshooting/Commands/PrepareTroubleshootingPlaybackHandler.cs

@@ -1,3 +1,4 @@
+using System.IO.Abstractions;
 using Dapper;
 using ErsatzTV.Application.Streaming;
 using ErsatzTV.Core;
@@ -30,6 +31,7 @@ public class PrepareTroubleshootingPlaybackHandler(
     IJellyfinPathReplacementService jellyfinPathReplacementService,
     IEmbyPathReplacementService embyPathReplacementService,
     IFFmpegProcessService ffmpegProcessService,
+    IFileSystem fileSystem,
     ILocalFileSystem localFileSystem,
     ISongVideoGenerator songVideoGenerator,
     IWatermarkSelector watermarkSelector,
@@ -471,7 +473,7 @@ public class PrepareTroubleshootingPlaybackHandler(
         string path = await GetLocalPath(mediaItem, cancellationToken);
 
         // check filesystem first
-        if (localFileSystem.FileExists(path))
+        if (fileSystem.File.Exists(path))
         {
             if (mediaItem is RemoteStream remoteStream)
             {

ErsatzTV.Core.Tests/ErsatzTV.Core.Tests.csproj

@@ -27,6 +27,7 @@
         <PackageReference Include="Serilog.Extensions.Logging" Version="9.0.2" />
         <PackageReference Include="Serilog.Sinks.Debug" Version="3.0.0" />
         <PackageReference Include="Shouldly" Version="4.3.0" />
+        <PackageReference Include="Testably.Abstractions.Testing" Version="5.0.0" />
     </ItemGroup>
 
     <ItemGroup>

ErsatzTV.Core.Tests/FFmpeg/CustomStreamSelectorTests.cs

@@ -2,11 +2,11 @@ using Destructurama;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.FFmpeg;
 using ErsatzTV.Core.Interfaces.FFmpeg;
-using ErsatzTV.Core.Tests.Fakes;
 using Microsoft.Extensions.Logging;
 using NUnit.Framework;
 using Serilog;
 using Shouldly;
+using Testably.Abstractions.Testing;
 
 namespace ErsatzTV.Core.Tests.FFmpeg;
 
@@ -94,9 +94,10 @@ public class CustomStreamSelectorTests
                     - "eng"
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -123,9 +124,10 @@ public class CustomStreamSelectorTests
                   - audio_language: ["und"]
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -152,9 +154,10 @@ public class CustomStreamSelectorTests
                   - audio_language: ["en", "eng"]
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -187,9 +190,10 @@ public class CustomStreamSelectorTests
                     disable_subtitles: true
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -217,9 +221,10 @@ public class CustomStreamSelectorTests
                     - "en*"
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -248,9 +253,10 @@ public class CustomStreamSelectorTests
                 """;
             _audioVersion = GetTestAudioVersion("en");
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -279,9 +285,10 @@ public class CustomStreamSelectorTests
                     disable_subtitles: true
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -305,9 +312,10 @@ public class CustomStreamSelectorTests
                     - "eng"
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -337,9 +345,10 @@ public class CustomStreamSelectorTests
                     - "en*"
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -378,9 +387,10 @@ public class CustomStreamSelectorTests
                 }
             ];
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -413,9 +423,10 @@ public class CustomStreamSelectorTests
                     disable_subtitles: true
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -450,9 +461,10 @@ public class CustomStreamSelectorTests
                     disable_subtitles: true
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -492,9 +504,10 @@ public class CustomStreamSelectorTests
                     disable_subtitles: true
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -528,9 +541,10 @@ public class CustomStreamSelectorTests
                     disable_subtitles: true
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -568,9 +582,10 @@ public class CustomStreamSelectorTests
                     - "riff"
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -600,9 +615,10 @@ public class CustomStreamSelectorTests
                     - "movie"
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -634,9 +650,10 @@ public class CustomStreamSelectorTests
                     - "signs"
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -668,9 +685,10 @@ public class CustomStreamSelectorTests
                     - "songs"
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -699,9 +717,10 @@ public class CustomStreamSelectorTests
                     subtitle_condition: "forced"
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -730,9 +749,10 @@ public class CustomStreamSelectorTests
                     subtitle_condition: "lang like 'en%' and external"
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -761,9 +781,10 @@ public class CustomStreamSelectorTests
                     audio_condition: "title like '%movie%'"
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -792,9 +813,10 @@ public class CustomStreamSelectorTests
                     audio_condition: "channels > 2"
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -822,9 +844,10 @@ public class CustomStreamSelectorTests
                     audio_title_blocklist: ["riff"]
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -853,9 +876,10 @@ public class CustomStreamSelectorTests
                     subtitle_language: ["jp","en*"]
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,
@@ -885,9 +909,10 @@ public class CustomStreamSelectorTests
                     subtitle_language: ["es*","de*"]
                 """;
 
-            var streamSelector = new CustomStreamSelector(
+            var fileSystem = new MockFileSystem();
-                new FakeLocalFileSystem([new FakeFileEntry(TestFileName) { Contents = YAML }]),
+            fileSystem.Initialize()
-                _logger);
+                .WithFile(TestFileName).Which(f => f.HasStringContent(YAML));
+            var streamSelector = new CustomStreamSelector(fileSystem, _logger);
 
             StreamSelectorResult result = await streamSelector.SelectStreams(
                 _channel,

ErsatzTV.Core.Tests/FFmpeg/FFmpegStreamSelectorTests.cs

@@ -8,6 +8,7 @@ using Microsoft.Extensions.Logging;
 using NSubstitute;
 using NUnit.Framework;
 using Shouldly;
+using Testably.Abstractions.Testing;
 
 namespace ErsatzTV.Core.Tests.FFmpeg;
 
@@ -61,7 +62,7 @@ public class FFmpegStreamSelectorTests
                 new ScriptEngine(Substitute.For<ILogger<ScriptEngine>>()),
                 Substitute.For<IStreamSelectorRepository>(),
                 Substitute.For<IConfigElementRepository>(),
-                Substitute.For<ILocalFileSystem>(),
+                new MockFileSystem(),
                 languageCodeService,
                 Substitute.For<ILogger<FFmpegStreamSelector>>());
 
@@ -123,7 +124,7 @@ public class FFmpegStreamSelectorTests
                 new ScriptEngine(Substitute.For<ILogger<ScriptEngine>>()),
                 Substitute.For<IStreamSelectorRepository>(),
                 Substitute.For<IConfigElementRepository>(),
-                Substitute.For<ILocalFileSystem>(),
+                new MockFileSystem(),
                 languageCodeService,
                 Substitute.For<ILogger<FFmpegStreamSelector>>());
 
@@ -173,7 +174,7 @@ public class FFmpegStreamSelectorTests
                 new ScriptEngine(Substitute.For<ILogger<ScriptEngine>>()),
                 Substitute.For<IStreamSelectorRepository>(),
                 Substitute.For<IConfigElementRepository>(),
-                Substitute.For<ILocalFileSystem>(),
+                new MockFileSystem(),
                 languageCodeService,
                 Substitute.For<ILogger<FFmpegStreamSelector>>());
 

ErsatzTV.Core.Tests/Fakes/FakeFileEntry.cs

@@ -1,8 +0,0 @@
-namespace ErsatzTV.Core.Tests.Fakes;
-
-public record FakeFileEntry(string Path)
-{
-    public DateTime LastWriteTime { get; set; } = SystemTime.MinValueUtc;
-
-    public string Contents { get; set; }
-}

ErsatzTV.Core.Tests/Fakes/FakeFolderEntry.cs

@@ -1,3 +0,0 @@
-namespace ErsatzTV.Core.Tests.Fakes;
-
-public record FakeFolderEntry(string Path);

ErsatzTV.Core.Tests/Fakes/FakeLocalFileSystem.cs

@@ -1,99 +0,0 @@
-using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Interfaces.Metadata;
-
-namespace ErsatzTV.Core.Tests.Fakes;
-
-public class FakeLocalFileSystem : ILocalFileSystem
-{
-    private readonly List<FakeFileEntry> _files;
-    private readonly List<FakeFolderEntry> _folders;
-
-    public FakeLocalFileSystem(List<FakeFileEntry> files) : this(files, new List<FakeFolderEntry>())
-    {
-    }
-
-    public FakeLocalFileSystem(List<FakeFileEntry> files, List<FakeFolderEntry> folders)
-    {
-        _files = files;
-
-        var allFolders = new List<string>(folders.Map(f => f.Path));
-        foreach (FakeFileEntry file in _files)
-        {
-            List<DirectoryInfo> moreFolders =
-                Split(new DirectoryInfo(Path.GetDirectoryName(file.Path) ?? string.Empty));
-            allFolders.AddRange(moreFolders.Map(i => i.FullName));
-        }
-
-        _folders = allFolders.Distinct().Map(f => new FakeFolderEntry(f)).ToList();
-    }
-
-    public Unit EnsureFolderExists(string folder) => Unit.Default;
-
-    public DateTime GetLastWriteTime(string path) =>
-        Optional(_files.SingleOrDefault(f => f.Path == path))
-            .Map(f => f.LastWriteTime)
-            .IfNone(SystemTime.MinValueUtc);
-
-    public bool IsLibraryPathAccessible(LibraryPath libraryPath) =>
-        _folders.Any(f => f.Path == libraryPath.Path);
-
-    public IEnumerable<string> ListSubdirectories(string folder) =>
-        _folders.Map(f => f.Path).Filter(f => f.StartsWith(folder) && Directory.GetParent(f)?.FullName == folder);
-
-    public IEnumerable<string> ListFiles(string folder) =>
-        _files.Map(f => f.Path).Filter(f => Path.GetDirectoryName(f) == folder);
-
-    // TODO: this isn't accurate, need to use search pattern
-    public IEnumerable<string> ListFiles(string folder, string searchPattern) =>
-        _files.Map(f => f.Path).Filter(f => Path.GetDirectoryName(f) == folder);
-
-    public IEnumerable<string> ListFiles(string folder, params string[] searchPatterns) =>
-        _files.Map(f => f.Path).Filter(f => Path.GetDirectoryName(f) == folder);
-
-    public bool FileExists(string path) => _files.Any(f => f.Path == path);
-    public bool FolderExists(string folder) => false;
-
-    public Task<Either<BaseError, Unit>> CopyFile(string source, string destination) =>
-        Task.FromResult(Right<BaseError, Unit>(Unit.Default));
-
-    public Unit EmptyFolder(string folder) => Unit.Default;
-
-    public async Task<string> ReadAllText(string path) => await _files
-        .Filter(f => f.Path == path)
-        .HeadOrNone()
-        .Select(f => f.Contents)
-        .IfNoneAsync(string.Empty);
-
-    public async Task<string[]> ReadAllLines(string path) => await _files
-        .Filter(f => f.Path == path)
-        .HeadOrNone()
-        .Select(f => f.Contents)
-        .IfNoneAsync(string.Empty)
-        .Map(s => s.Split(Environment.NewLine));
-
-    public Task<byte[]> GetHash(string path) => throw new NotSupportedException();
-
-    public string GetCustomOrDefaultFile(string folder, string file)
-    {
-        string path = Path.Combine(folder, file);
-        return FileExists(path) ? path : Path.Combine(folder, $"_{file}");
-    }
-
-    private static List<DirectoryInfo> Split(DirectoryInfo path)
-    {
-        var result = new List<DirectoryInfo>();
-        if (path == null || string.IsNullOrWhiteSpace(path.FullName))
-        {
-            return result;
-        }
-
-        if (path.Parent != null)
-        {
-            result.AddRange(Split(path.Parent));
-        }
-
-        result.Add(path);
-
-        return result;
-    }
-}

ErsatzTV.Core.Tests/Scheduling/ClassicScheduling/ContinuePlayoutTests.cs

@@ -1,6 +1,5 @@
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Domain.Scheduling;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Interfaces.Scheduling;
 using ErsatzTV.Core.Scheduling;
@@ -8,6 +7,7 @@ using ErsatzTV.Core.Tests.Fakes;
 using NSubstitute;
 using NUnit.Framework;
 using Shouldly;
+using Testably.Abstractions.Testing;
 
 namespace ErsatzTV.Core.Tests.Scheduling.ClassicScheduling;
 
@@ -588,7 +588,6 @@ public class ContinuePlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -596,7 +595,7 @@ public class ContinuePlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -714,7 +713,6 @@ public class ContinuePlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -722,7 +720,7 @@ public class ContinuePlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -842,7 +840,6 @@ public class ContinuePlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -850,7 +847,7 @@ public class ContinuePlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 

ErsatzTV.Core.Tests/Scheduling/ClassicScheduling/NewPlayoutTests.cs

@@ -1,7 +1,6 @@
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Domain.Filler;
 using ErsatzTV.Core.Domain.Scheduling;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Interfaces.Scheduling;
 using ErsatzTV.Core.Scheduling;
@@ -9,6 +8,7 @@ using ErsatzTV.Core.Tests.Fakes;
 using NSubstitute;
 using NUnit.Framework;
 using Shouldly;
+using Testably.Abstractions.Testing;
 
 namespace ErsatzTV.Core.Tests.Scheduling.ClassicScheduling;
 
@@ -597,7 +597,6 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -605,7 +604,7 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -717,7 +716,6 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -725,7 +723,7 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -888,7 +886,6 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -896,7 +893,7 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -1018,7 +1015,6 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -1026,7 +1022,7 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -1147,7 +1143,6 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -1155,7 +1150,7 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -1277,7 +1272,6 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -1285,7 +1279,7 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -1412,7 +1406,6 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -1420,7 +1413,7 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -1547,7 +1540,6 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -1555,7 +1547,7 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -1691,7 +1683,6 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -1699,7 +1690,7 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -1828,7 +1819,6 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -1836,7 +1826,7 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -1931,7 +1921,6 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -1939,7 +1928,7 @@ public class NewPlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 

ErsatzTV.Core.Tests/Scheduling/ClassicScheduling/PlayoutBuilderTestBase.cs

@@ -2,7 +2,6 @@ using Destructurama;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Domain.Filler;
 using ErsatzTV.Core.Domain.Scheduling;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Interfaces.Scheduling;
 using ErsatzTV.Core.Scheduling;
@@ -11,6 +10,7 @@ using Microsoft.Extensions.Logging;
 using NSubstitute;
 using NUnit.Framework;
 using Serilog;
+using Testably.Abstractions.Testing;
 
 namespace ErsatzTV.Core.Tests.Scheduling.ClassicScheduling;
 
@@ -66,7 +66,6 @@ public abstract class PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -74,7 +73,7 @@ public abstract class PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 
@@ -182,7 +181,6 @@ public abstract class PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -190,7 +188,7 @@ public abstract class PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 

ErsatzTV.Core.Tests/Scheduling/ClassicScheduling/RefreshPlayoutTests.cs

@@ -1,6 +1,5 @@
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Domain.Scheduling;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Interfaces.Scheduling;
 using ErsatzTV.Core.Scheduling;
@@ -8,6 +7,7 @@ using ErsatzTV.Core.Tests.Fakes;
 using NSubstitute;
 using NUnit.Framework;
 using Shouldly;
+using Testably.Abstractions.Testing;
 
 namespace ErsatzTV.Core.Tests.Scheduling.ClassicScheduling;
 
@@ -101,7 +101,6 @@ public class RefreshPlayoutTests : PlayoutBuilderTestBase
         IArtistRepository artistRepo = Substitute.For<IArtistRepository>();
         IMultiEpisodeShuffleCollectionEnumeratorFactory factory =
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>();
-        ILocalFileSystem localFileSystem = Substitute.For<ILocalFileSystem>();
         IRerunHelper rerunHelper = Substitute.For<IRerunHelper>();
         var builder = new PlayoutBuilder(
             configRepo,
@@ -109,7 +108,7 @@ public class RefreshPlayoutTests : PlayoutBuilderTestBase
             televisionRepo,
             artistRepo,
             factory,
-            localFileSystem,
+            new MockFileSystem(),
             rerunHelper,
             Logger);
 

ErsatzTV.Core.Tests/Scheduling/ScheduleIntegrationTests.cs

@@ -24,6 +24,7 @@ using NUnit.Framework;
 using Serilog;
 using Serilog.Events;
 using Serilog.Extensions.Logging;
+using MockFileSystem = Testably.Abstractions.Testing.MockFileSystem;
 
 namespace ErsatzTV.Core.Tests.Scheduling;
 
@@ -108,6 +109,7 @@ public class ScheduleIntegrationTests
         ISearchIndex searchIndex = provider.GetRequiredService<ISearchIndex>();
         await searchIndex.Initialize(
             new LocalFileSystem(
+                new MockFileSystem(),
                 provider.GetRequiredService<IClient>(),
                 provider.GetRequiredService<ILogger<LocalFileSystem>>()),
             provider.GetRequiredService<IConfigElementRepository>(),
@@ -125,7 +127,7 @@ public class ScheduleIntegrationTests
             new TelevisionRepository(factory, provider.GetRequiredService<ILogger<TelevisionRepository>>()),
             new ArtistRepository(factory),
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>(),
-            Substitute.For<ILocalFileSystem>(),
+            new MockFileSystem(),
             Substitute.For<IRerunHelper>(),
             provider.GetRequiredService<ILogger<PlayoutBuilder>>());
 
@@ -321,7 +323,7 @@ public class ScheduleIntegrationTests
             new TelevisionRepository(factory, provider.GetRequiredService<ILogger<TelevisionRepository>>()),
             new ArtistRepository(factory),
             Substitute.For<IMultiEpisodeShuffleCollectionEnumeratorFactory>(),
-            Substitute.For<ILocalFileSystem>(),
+            new MockFileSystem(),
             Substitute.For<IRerunHelper>(),
             provider.GetRequiredService<ILogger<PlayoutBuilder>>());
 

ErsatzTV.Core/ErsatzTV.Core.csproj

@@ -32,6 +32,7 @@
         <PackageReference Include="SkiaSharp" Version="3.119.1" />
         <PackageReference Include="SkiaSharp.NativeAssets.Linux.NoDependencies" Version="3.119.1" />
         <PackageReference Include="System.CommandLine" Version="2.0.0-rc.2.25502.107" />
+        <PackageReference Include="Testably.Abstractions" Version="10.0.0" />
         <PackageReference Include="TimeSpanParserUtil" Version="1.2.0" />
         <PackageReference Include="YamlDotNet" Version="16.3.0" />
     </ItemGroup>

ErsatzTV.Core/FFmpeg/CustomStreamSelector.cs

@@ -1,8 +1,8 @@
+using System.IO.Abstractions;
 using System.IO.Enumeration;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.FFmpeg.Selector;
 using ErsatzTV.Core.Interfaces.FFmpeg;
-using ErsatzTV.Core.Interfaces.Metadata;
 using Microsoft.Extensions.Logging;
 using NCalc;
 using YamlDotNet.Serialization;
@@ -10,7 +10,7 @@ using YamlDotNet.Serialization.NamingConventions;
 
 namespace ErsatzTV.Core.FFmpeg;
 
-public class CustomStreamSelector(ILocalFileSystem localFileSystem, ILogger<CustomStreamSelector> logger)
+public class CustomStreamSelector(IFileSystem fileSystem, ILogger<CustomStreamSelector> logger)
     : ICustomStreamSelector
 {
     public async Task<StreamSelectorResult> SelectStreams(
@@ -25,7 +25,7 @@ public class CustomStreamSelector(ILocalFileSystem localFileSystem, ILogger<Cust
                 FileSystemLayout.ChannelStreamSelectorsFolder,
                 channel.StreamSelector);
 
-            if (!localFileSystem.FileExists(streamSelectorFile))
+            if (!fileSystem.File.Exists(streamSelectorFile))
             {
                 logger.LogWarning("YAML stream selector file {File} does not exist; aborting.", channel.StreamSelector);
                 return StreamSelectorResult.None;
@@ -327,7 +327,7 @@ public class CustomStreamSelector(ILocalFileSystem localFileSystem, ILogger<Cust
     {
         try
         {
-            string yaml = await localFileSystem.ReadAllText(streamSelectorFile);
+            string yaml = await fileSystem.File.ReadAllTextAsync(streamSelectorFile);
 
             IDeserializer deserializer = new DeserializerBuilder()
                 .WithNamingConvention(CamelCaseNamingConvention.Instance)

ErsatzTV.Core/FFmpeg/FFmpegStreamSelector.cs

@@ -2,6 +2,7 @@
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
+using System.IO.Abstractions;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.FFmpeg;
 using ErsatzTV.Core.Interfaces.Metadata;
@@ -15,7 +16,7 @@ namespace ErsatzTV.Core.FFmpeg;
 public class FFmpegStreamSelector : IFFmpegStreamSelector
 {
     private readonly IConfigElementRepository _configElementRepository;
-    private readonly ILocalFileSystem _localFileSystem;
+    private readonly IFileSystem _fileSystem;
     private readonly ILanguageCodeService _languageCodeService;
     private readonly ILogger<FFmpegStreamSelector> _logger;
     private readonly IScriptEngine _scriptEngine;
@@ -25,14 +26,14 @@ public class FFmpegStreamSelector : IFFmpegStreamSelector
         IScriptEngine scriptEngine,
         IStreamSelectorRepository streamSelectorRepository,
         IConfigElementRepository configElementRepository,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ILanguageCodeService languageCodeService,
         ILogger<FFmpegStreamSelector> logger)
     {
         _scriptEngine = scriptEngine;
         _streamSelectorRepository = streamSelectorRepository;
         _configElementRepository = configElementRepository;
-        _localFileSystem = localFileSystem;
+        _fileSystem = fileSystem;
         _languageCodeService = languageCodeService;
         _logger = logger;
     }
@@ -318,7 +319,7 @@ public class FFmpegStreamSelector : IFFmpegStreamSelector
             "js");
 
         _logger.LogDebug("Checking for JS Script at {Path}", jsScriptPath);
-        if (!_localFileSystem.FileExists(jsScriptPath))
+        if (!_fileSystem.File.Exists(jsScriptPath))
         {
             _logger.LogDebug("Unable to locate episode audio stream selector script; falling back to built-in logic");
             return Option<MediaStream>.None;
@@ -358,7 +359,7 @@ public class FFmpegStreamSelector : IFFmpegStreamSelector
             "js");
 
         _logger.LogDebug("Checking for JS Script at {Path}", jsScriptPath);
-        if (!_localFileSystem.FileExists(jsScriptPath))
+        if (!_fileSystem.File.Exists(jsScriptPath))
         {
             _logger.LogDebug(
                 "Unable to locate movie audio stream selector script; falling back to built-in logic");

ErsatzTV.Core/Interfaces/Metadata/ILocalFileSystem.cs

@@ -1,22 +1,15 @@
-using ErsatzTV.Core.Domain;
+namespace ErsatzTV.Core.Interfaces.Metadata;
-
-namespace ErsatzTV.Core.Interfaces.Metadata;
 
 public interface ILocalFileSystem
 {
     Unit EnsureFolderExists(string folder);
     DateTime GetLastWriteTime(string path);
-    bool IsLibraryPathAccessible(LibraryPath libraryPath);
     IEnumerable<string> ListSubdirectories(string folder);
     IEnumerable<string> ListFiles(string folder);
     IEnumerable<string> ListFiles(string folder, string searchPattern);
     IEnumerable<string> ListFiles(string folder, params string[] searchPatterns);
-    bool FileExists(string path);
-    bool FolderExists(string folder);
     Task<Either<BaseError, Unit>> CopyFile(string source, string destination);
     Unit EmptyFolder(string folder);
-    Task<string> ReadAllText(string path);
-    Task<string[]> ReadAllLines(string path);
     Task<byte[]> GetHash(string path);
     string GetCustomOrDefaultFile(string folder, string file);
 }

ErsatzTV.Core/Metadata/LocalFileSystem.cs

@@ -1,21 +1,21 @@
 using System.Diagnostics.CodeAnalysis;
+using System.IO.Abstractions;
 using System.Security.Cryptography;
 using Bugsnag;
-using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Metadata;
 using Microsoft.Extensions.Logging;
 
 namespace ErsatzTV.Core.Metadata;
 
-public class LocalFileSystem(IClient client, ILogger<LocalFileSystem> logger) : ILocalFileSystem
+public class LocalFileSystem(IFileSystem fileSystem, IClient client, ILogger<LocalFileSystem> logger) : ILocalFileSystem
 {
     public Unit EnsureFolderExists(string folder)
     {
         try
         {
-            if (folder != null && !Directory.Exists(folder))
+            if (folder != null && !fileSystem.Directory.Exists(folder))
             {
-                Directory.CreateDirectory(folder);
+                fileSystem.Directory.CreateDirectory(folder);
             }
         }
         catch (Exception ex)
@@ -30,7 +30,7 @@ public class LocalFileSystem(IClient client, ILogger<LocalFileSystem> logger) :
     {
         try
         {
-            return File.GetLastWriteTimeUtc(path);
+            return fileSystem.File.GetLastWriteTimeUtc(path);
         }
         catch
         {
@@ -38,16 +38,13 @@ public class LocalFileSystem(IClient client, ILogger<LocalFileSystem> logger) :
         }
     }
 
-    public bool IsLibraryPathAccessible(LibraryPath libraryPath) =>
-        Directory.Exists(libraryPath.Path);
-
     public IEnumerable<string> ListSubdirectories(string folder)
     {
-        if (Directory.Exists(folder))
+        if (fileSystem.Directory.Exists(folder))
         {
             try
             {
-                return Directory.EnumerateDirectories(folder);
+                return fileSystem.Directory.EnumerateDirectories(folder);
             }
             catch (UnauthorizedAccessException)
             {
@@ -65,11 +62,11 @@ public class LocalFileSystem(IClient client, ILogger<LocalFileSystem> logger) :
 
     public IEnumerable<string> ListFiles(string folder)
     {
-        if (Directory.Exists(folder))
+        if (fileSystem.Directory.Exists(folder))
         {
             try
             {
-                return Directory.EnumerateFiles(folder, "*", SearchOption.TopDirectoryOnly)
+                return fileSystem.Directory.EnumerateFiles(folder, "*", SearchOption.TopDirectoryOnly)
                     .Where(path => !Path.GetFileName(path).StartsWith("._", StringComparison.OrdinalIgnoreCase));
             }
             catch (UnauthorizedAccessException)
@@ -88,11 +85,11 @@ public class LocalFileSystem(IClient client, ILogger<LocalFileSystem> logger) :
 
     public IEnumerable<string> ListFiles(string folder, string searchPattern)
     {
-        if (folder is not null && Directory.Exists(folder))
+        if (folder is not null && fileSystem.Directory.Exists(folder))
         {
             try
             {
-                return Directory.EnumerateFiles(folder, searchPattern, SearchOption.TopDirectoryOnly)
+                return fileSystem.Directory.EnumerateFiles(folder, searchPattern, SearchOption.TopDirectoryOnly)
                     .Where(path => !Path.GetFileName(path).StartsWith("._", StringComparison.OrdinalIgnoreCase));
             }
             catch (UnauthorizedAccessException)
@@ -111,14 +108,15 @@ public class LocalFileSystem(IClient client, ILogger<LocalFileSystem> logger) :
 
     public IEnumerable<string> ListFiles(string folder, params string[] searchPatterns)
     {
-        if (folder is not null && Directory.Exists(folder))
+        if (folder is not null && fileSystem.Directory.Exists(folder))
         {
             try
             {
                 return searchPatterns
                     .SelectMany(searchPattern =>
-                        Directory.EnumerateFiles(folder, searchPattern, SearchOption.TopDirectoryOnly)
+                        fileSystem.Directory.EnumerateFiles(folder, searchPattern, SearchOption.TopDirectoryOnly)
-                            .Where(path => !Path.GetFileName(path).StartsWith("._", StringComparison.OrdinalIgnoreCase)))
+                            .Where(path =>
+                                !Path.GetFileName(path).StartsWith("._", StringComparison.OrdinalIgnoreCase)))
                     .Distinct();
             }
             catch (UnauthorizedAccessException)
@@ -135,22 +133,18 @@ public class LocalFileSystem(IClient client, ILogger<LocalFileSystem> logger) :
         return new List<string>();
     }
 
-    public bool FileExists(string path) => File.Exists(path);
-
-    public bool FolderExists(string folder) => Directory.Exists(folder);
-
     public async Task<Either<BaseError, Unit>> CopyFile(string source, string destination)
     {
         try
         {
             string directory = Path.GetDirectoryName(destination) ?? string.Empty;
-            if (!Directory.Exists(directory))
+            if (!fileSystem.Directory.Exists(directory))
             {
-                Directory.CreateDirectory(directory);
+                fileSystem.Directory.CreateDirectory(directory);
             }
 
-            await using FileStream sourceStream = File.OpenRead(source);
+            await using FileSystemStream sourceStream = fileSystem.File.OpenRead(source);
-            await using FileStream destinationStream = File.Create(destination);
+            await using FileSystemStream destinationStream = fileSystem.File.Create(destination);
             await sourceStream.CopyToAsync(destinationStream);
 
             return Unit.Default;
@@ -166,14 +160,14 @@ public class LocalFileSystem(IClient client, ILogger<LocalFileSystem> logger) :
     {
         try
         {
-            foreach (string file in Directory.GetFiles(folder))
+            foreach (string file in fileSystem.Directory.GetFiles(folder))
             {
-                File.Delete(file);
+                fileSystem.File.Delete(file);
             }
 
-            foreach (string directory in Directory.GetDirectories(folder))
+            foreach (string directory in fileSystem.Directory.GetDirectories(folder))
             {
-                Directory.Delete(directory, true);
+                fileSystem.Directory.Delete(directory, true);
             }
         }
         catch (Exception ex)
@@ -184,20 +178,17 @@ public class LocalFileSystem(IClient client, ILogger<LocalFileSystem> logger) :
         return Unit.Default;
     }
 
-    public Task<string> ReadAllText(string path) => File.ReadAllTextAsync(path);
-    public Task<string[]> ReadAllLines(string path) => File.ReadAllLinesAsync(path);
-
     [SuppressMessage("Security", "CA5351:Do Not Use Broken Cryptographic Algorithms")]
     public async Task<byte[]> GetHash(string path)
     {
         using var md5 = MD5.Create();
-        await using var stream = File.OpenRead(path);
+        await using var stream = fileSystem.File.OpenRead(path);
         return await md5.ComputeHashAsync(stream);
     }
 
     public string GetCustomOrDefaultFile(string folder, string file)
     {
         string path = Path.Combine(folder, file);
-        return FileExists(path) ? path : Path.Combine(folder, $"_{file}");
+        return fileSystem.File.Exists(path) ? path : Path.Combine(folder, $"_{file}");
     }
 }

ErsatzTV.Core/Scheduling/PlayoutBuilder.cs

@@ -1,9 +1,9 @@
-using System.Reflection;
+using System.IO.Abstractions;
+using System.Reflection;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Domain.Filler;
 using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Extensions;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Interfaces.Scheduling;
 using ErsatzTV.Core.Scheduling.Engine;
@@ -20,10 +20,10 @@ public class PlayoutBuilder : IPlayoutBuilder
 {
     private readonly IArtistRepository _artistRepository;
     private readonly IConfigElementRepository _configElementRepository;
-    private readonly ILocalFileSystem _localFileSystem;
     private readonly IRerunHelper _rerunHelper;
     private readonly IMediaCollectionRepository _mediaCollectionRepository;
     private readonly IMultiEpisodeShuffleCollectionEnumeratorFactory _multiEpisodeFactory;
+    private readonly IFileSystem _fileSystem;
     private readonly ITelevisionRepository _televisionRepository;
     private Playlist _debugPlaylist;
     private ILogger<PlayoutBuilder> _logger;
@@ -34,7 +34,7 @@ public class PlayoutBuilder : IPlayoutBuilder
         ITelevisionRepository televisionRepository,
         IArtistRepository artistRepository,
         IMultiEpisodeShuffleCollectionEnumeratorFactory multiEpisodeFactory,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         IRerunHelper rerunHelper,
         ILogger<PlayoutBuilder> logger)
     {
@@ -43,7 +43,7 @@ public class PlayoutBuilder : IPlayoutBuilder
         _televisionRepository = televisionRepository;
         _artistRepository = artistRepository;
         _multiEpisodeFactory = multiEpisodeFactory;
-        _localFileSystem = localFileSystem;
+        _fileSystem = fileSystem;
         _rerunHelper = rerunHelper;
         _logger = logger;
     }
@@ -400,12 +400,12 @@ public class PlayoutBuilder : IPlayoutBuilder
                 name =>
                 {
                     _logger.LogError(
-                        "Unable to rebuild playout; {CollectionType} {CollectionName} has no valid items!",
+                        "Unable to rebuild playout; {CollectionType} \"{CollectionName}\" has no valid items!",
                         emptyCollection.CollectionType,
                         name);
 
                     return BaseError.New(
-                        $"Unable to rebuild playout; {emptyCollection.CollectionType} {name} has no valid items!");
+                        $"Unable to rebuild playout; {emptyCollection.CollectionType} \"{name}\" has no valid items!");
                 },
                 () =>
                 {
@@ -1403,7 +1403,7 @@ public class PlayoutBuilder : IPlayoutBuilder
                                 guid.Guid.Replace("://", "_")),
                             "js");
                         _logger.LogDebug("Checking for JS Script at {Path}", jsScriptPath);
-                        if (_localFileSystem.FileExists(jsScriptPath))
+                        if (_fileSystem.File.Exists(jsScriptPath))
                         {
                             _logger.LogDebug("Found JS Script at {Path}", jsScriptPath);
                             try

ErsatzTV.Core/Scheduling/ScriptedScheduling/ScriptedPlayoutBuilder.cs

@@ -1,8 +1,8 @@
 using System.CommandLine.Parsing;
+using System.IO.Abstractions;
 using CliWrap;
 using CliWrap.Buffered;
 using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Interfaces.Scheduling;
 using ErsatzTV.Core.Scheduling.Engine;
@@ -14,7 +14,7 @@ public class ScriptedPlayoutBuilder(
     IConfigElementRepository configElementRepository,
     IScriptedPlayoutBuilderService scriptedPlayoutBuilderService,
     ISchedulingEngine schedulingEngine,
-    ILocalFileSystem localFileSystem,
+    IFileSystem fileSystem,
     ILogger<ScriptedPlayoutBuilder> logger)
     : IScriptedPlayoutBuilder
 {
@@ -38,7 +38,7 @@ public class ScriptedPlayoutBuilder(
             string scriptFile = args[0];
             string[] scriptArgs = args.Skip(1).ToArray();
 
-            if (!localFileSystem.FileExists(scriptFile))
+            if (!fileSystem.File.Exists(scriptFile))
             {
                 logger.LogError(
                     "Cannot build scripted playout; schedule file {File} does not exist",

ErsatzTV.Core/Scheduling/YamlScheduling/SequentialPlayoutBuilder.cs

@@ -1,7 +1,7 @@
 using System.Collections.Immutable;
+using System.IO.Abstractions;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Domain.Scheduling;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Interfaces.Scheduling;
 //using ErsatzTV.Core.Scheduling.Engine;
@@ -17,7 +17,7 @@ namespace ErsatzTV.Core.Scheduling.YamlScheduling;
 
 public class SequentialPlayoutBuilder(
     //ISchedulingEngine schedulingEngine,
-    ILocalFileSystem localFileSystem,
+    IFileSystem fileSystem,
     IConfigElementRepository configElementRepository,
     IMediaCollectionRepository mediaCollectionRepository,
     IChannelRepository channelRepository,
@@ -38,7 +38,7 @@ public class SequentialPlayoutBuilder(
 
         PlayoutBuildResult result = PlayoutBuildResult.Empty;
 
-        if (!localFileSystem.FileExists(playout.ScheduleFile))
+        if (!fileSystem.File.Exists(playout.ScheduleFile))
         {
             logger.LogWarning("Sequential schedule file {File} does not exist; aborting.", playout.ScheduleFile);
             return BaseError.New($"Sequential schedule file {playout.ScheduleFile} does not exist");

ErsatzTV.Infrastructure.Tests/ErsatzTV.Infrastructure.Tests.csproj

@@ -22,10 +22,17 @@
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>
         <PackageReference Include="Shouldly" Version="4.3.0" />
+        <PackageReference Include="Testably.Abstractions.Testing" Version="5.0.0" />
     </ItemGroup>
 
     <ItemGroup>
         <ProjectReference Include="..\ErsatzTV.Infrastructure\ErsatzTV.Infrastructure.csproj" />
     </ItemGroup>
 
+    <ItemGroup>
+      <EmbeddedResource Include="..\ErsatzTV\Resources\sequential-schedule.schema.json">
+        <Link>Resources/sequential-schedule.schema.json</Link>
+      </EmbeddedResource>
+    </ItemGroup>
+
 </Project>

ErsatzTV.Infrastructure.Tests/Metadata/LocalStatisticsProviderTests.cs

@@ -8,6 +8,7 @@ using Microsoft.Extensions.Logging;
 using NSubstitute;
 using NUnit.Framework;
 using Shouldly;
+using Testably.Abstractions.Testing;
 
 namespace ErsatzTV.Infrastructure.Tests.Metadata;
 
@@ -21,6 +22,7 @@ public class LocalStatisticsProviderTests
     {
         var provider = new LocalStatisticsProvider(
             Substitute.For<IMetadataRepository>(),
+            new MockFileSystem(),
             Substitute.For<ILocalFileSystem>(),
             Substitute.For<IClient>(),
             Substitute.For<IHardwareCapabilitiesFactory>(),

ErsatzTV.Infrastructure.Tests/Scheduling/SequentialScheduleValidatorTests.cs

@@ -0,0 +1,200 @@
+using System.Reflection;
+using ErsatzTV.Core;
+using ErsatzTV.Infrastructure.Scheduling;
+using Microsoft.Extensions.Logging;
+using NSubstitute;
+using NUnit.Framework;
+using Shouldly;
+using Testably.Abstractions.Testing;
+
+namespace ErsatzTV.Infrastructure.Tests.Scheduling;
+
+[TestFixture]
+public class SequentialScheduleValidatorTests
+{
+    private readonly string _schema;
+
+    public SequentialScheduleValidatorTests()
+    {
+        var assembly = Assembly.GetAssembly(typeof(SequentialScheduleValidatorTests));
+        assembly.ShouldNotBeNull();
+
+        using var stream = assembly.GetManifestResourceStream(
+            "ErsatzTV.Infrastructure.Tests.Resources.sequential-schedule.schema.json");
+        stream.ShouldNotBeNull();
+
+        using var reader = new StreamReader(stream);
+        _schema = reader.ReadToEnd();
+    }
+
+    [CancelAfter(2_000)]
+    [Test]
+    public async Task ValidateSchedule_Should_Succeed_Valid_Schedule(CancellationToken cancellationToken)
+    {
+        const string YAML =
+"""
+content:
+  - show:
+    key: "SOME_SHOW"
+    guids:
+      - source: "imdb"
+        value: "tt123456"
+    order: chronological
+  - search:
+    key: "FILLER"
+    query: "type:other_video"
+    order: "shuffle"
+
+reset:
+  - wait_until: '8:00am'
+    tomorrow: false
+    rewind_on_reset: true
+
+playout:
+  - duration: "30 minutes"
+    content: "SOME_SHOW"
+    discard_attempts: 2
+    offline_tail: false
+
+  - epg_group: true
+    advance: false
+
+  - pad_to_next: 30
+    content: "FILLER"
+    filler_kind: postroll
+    trim: true
+
+  - epg_group: false
+
+  - repeat: true
+""";
+
+        string schemaFileName = Path.Combine(FileSystemLayout.ResourcesCacheFolder, "sequential-schedule.schema.json");
+
+        var fileSystem = new MockFileSystem();
+        fileSystem.Initialize()
+            .WithFile(schemaFileName).Which(f => f.HasStringContent(_schema));
+
+        var validator = new SequentialScheduleValidator(
+            fileSystem,
+            Substitute.For<ILogger<SequentialScheduleValidator>>());
+
+        bool result = await validator.ValidateSchedule(YAML, false);
+        result.ShouldBeTrue();
+    }
+
+    [CancelAfter(2_000)]
+    [Test]
+    public async Task ValidateSchedule_Should_Fail_Invalid_Schedule(CancellationToken cancellationToken)
+    {
+        const string YAML =
+            """
+            content:
+              - show:
+                key: "SOME_SHOW"
+                guids22:
+                  - source: "imdb"
+                    value: "tt123456"
+                order: chronological
+              - search:
+                key: "FILLER"
+                query: "type:other_video"
+                order: "shuffle"
+
+            reset:
+              - wait_until: '8:00am'
+                tomorrow: false
+                rewind_on_reset: true
+
+            playout:
+              - duration: "30 minutes"
+                content: "SOME_SHOW"
+                discard_attempts: 2
+                offline_tail: false
+
+              - epg_group: true
+                advance: false
+
+              - pad_to_next: 30
+                content: "FILLER"
+                filler_kind: postroll
+                trim: true
+
+              - epg_group: false
+
+              - repeat: true
+            """;
+
+        string schemaFileName = Path.Combine(FileSystemLayout.ResourcesCacheFolder, "sequential-schedule.schema.json");
+
+        var fileSystem = new MockFileSystem();
+        fileSystem.Initialize()
+            .WithFile(schemaFileName).Which(f => f.HasStringContent(_schema));
+
+        var validator = new SequentialScheduleValidator(
+            fileSystem,
+            Substitute.For<ILogger<SequentialScheduleValidator>>());
+
+        bool result = await validator.ValidateSchedule(YAML, false);
+        result.ShouldBeFalse();
+    }
+
+    [CancelAfter(2_000)]
+    [Test]
+    public async Task GetValidationMessages_With_Invalid_Schedule(CancellationToken cancellationToken)
+    {
+        const string YAML =
+            """
+            content:
+              - show:
+                key: "SOME_SHOW"
+                guids22:
+                  - source: "imdb"
+                    value: "tt123456"
+                order: chronological
+              - search:
+                key: "FILLER"
+                query: "type:other_video"
+                order: "shuffle"
+
+            reset:
+              - wait_until: '8:00am'
+                tomorrow: false
+                rewind_on_reset: true
+
+            playout:
+              - duration: "30 minutes"
+                content: "SOME_SHOW"
+                discard_attempts: 2
+                offline_tail: false
+
+              - epg_group: true
+                advance: false
+
+              - pad_to_next: 30
+                content: "FILLER"
+                filler_kind: postroll
+                trim: true
+
+              - epg_group: false
+
+              - repeat: true
+            """;
+
+        string schemaFileName = Path.Combine(FileSystemLayout.ResourcesCacheFolder, "sequential-schedule.schema.json");
+
+        var fileSystem = new MockFileSystem();
+        fileSystem.Initialize()
+            .WithFile(schemaFileName).Which(f => f.HasStringContent(_schema));
+
+        var validator = new SequentialScheduleValidator(
+            fileSystem,
+            Substitute.For<ILogger<SequentialScheduleValidator>>());
+
+        IList<string> result = await validator.GetValidationMessages(YAML, false);
+        result.ShouldNotBeNull();
+        result.Count.ShouldBe(1);
+        result[0].ShouldContain("line 3");
+        result[0].ShouldContain("position 5");
+    }
+}

ErsatzTV.Infrastructure/Data/Repositories/LibraryRepository.cs

@@ -1,26 +1,18 @@
-using Dapper;
+using System.IO.Abstractions;
+using Dapper;
 using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Infrastructure.Extensions;
 using Microsoft.EntityFrameworkCore;
 
 namespace ErsatzTV.Infrastructure.Data.Repositories;
 
-public class LibraryRepository : ILibraryRepository
+public class LibraryRepository(IFileSystem fileSystem, IDbContextFactory<TvContext> dbContextFactory)
+    : ILibraryRepository
 {
-    private readonly IDbContextFactory<TvContext> _dbContextFactory;
-    private readonly ILocalFileSystem _localFileSystem;
-
-    public LibraryRepository(ILocalFileSystem localFileSystem, IDbContextFactory<TvContext> dbContextFactory)
-    {
-        _localFileSystem = localFileSystem;
-        _dbContextFactory = dbContextFactory;
-    }
-
     public async Task<LibraryPath> Add(LibraryPath libraryPath)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
         await dbContext.LibraryPaths.AddAsync(libraryPath);
         await dbContext.SaveChangesAsync();
         return libraryPath;
@@ -28,7 +20,7 @@ public class LibraryRepository : ILibraryRepository
 
     public async Task<Option<Library>> GetLibrary(int libraryId)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
         return await dbContext.Libraries
             .Include(l => l.Paths)
             .ThenInclude(p => p.LibraryFolders)
@@ -40,7 +32,7 @@ public class LibraryRepository : ILibraryRepository
 
     public async Task<Option<LocalLibrary>> GetLocal(int libraryId)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
         return await dbContext.LocalLibraries
             .OrderBy(l => l.Id)
             .SingleOrDefaultAsync(l => l.Id == libraryId)
@@ -49,7 +41,7 @@ public class LibraryRepository : ILibraryRepository
 
     public async Task<List<Library>> GetAll()
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
         return await dbContext.Libraries
             .AsNoTracking()
             .Include(l => l.MediaSource)
@@ -59,7 +51,7 @@ public class LibraryRepository : ILibraryRepository
 
     public async Task<Unit> UpdateLastScan(Library library)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
         return await dbContext.Connection.ExecuteAsync(
             "UPDATE Library SET LastScan = @LastScan WHERE Id = @Id",
             new { library.LastScan, library.Id }).ToUnit();
@@ -67,7 +59,7 @@ public class LibraryRepository : ILibraryRepository
 
     public async Task<Unit> UpdateLastScan(LibraryPath libraryPath)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
         return await dbContext.Connection.ExecuteAsync(
             "UPDATE LibraryPath SET LastScan = @LastScan WHERE Id = @Id",
             new { libraryPath.LastScan, libraryPath.Id }).ToUnit();
@@ -75,7 +67,7 @@ public class LibraryRepository : ILibraryRepository
 
     public async Task<List<LibraryPath>> GetLocalPaths(int libraryId)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
         return await dbContext.LocalLibraries
             .Include(l => l.Paths)
             .OrderBy(l => l.Id)
@@ -86,7 +78,7 @@ public class LibraryRepository : ILibraryRepository
 
     public async Task<int> CountMediaItemsByPath(int libraryPathId)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
         return await dbContext.Connection.QuerySingleAsync<int>(
             @"SELECT COUNT(*) FROM MediaItem WHERE LibraryPathId = @LibraryPathId",
             new { LibraryPathId = libraryPathId });
@@ -98,7 +90,7 @@ public class LibraryRepository : ILibraryRepository
         string path,
         string etag)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
 
         foreach (LibraryFolder folder in knownFolder)
         {
@@ -123,10 +115,10 @@ public class LibraryRepository : ILibraryRepository
 
     public async Task CleanEtagsForLibraryPath(LibraryPath libraryPath)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
 
         IOrderedEnumerable<LibraryFolder> orderedFolders = libraryPath.LibraryFolders
-            .Where(f => !_localFileSystem.FolderExists(f.Path))
+            .Where(f => !fileSystem.Directory.Exists(f.Path))
             .OrderByDescending(lp => lp.Path.Length);
 
         foreach (LibraryFolder folder in orderedFolders)
@@ -152,7 +144,7 @@ public class LibraryRepository : ILibraryRepository
             return Option<int>.None;
         }
 
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync(cancellationToken);
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync(cancellationToken);
 
         return await dbContext.LibraryFolders
             .AsNoTracking()
@@ -166,7 +158,7 @@ public class LibraryRepository : ILibraryRepository
         Option<int> maybeParentFolder,
         string folder)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
 
         // load from db or create new folder
         LibraryFolder knownFolder = await libraryPath.LibraryFolders
@@ -199,7 +191,7 @@ public class LibraryRepository : ILibraryRepository
 
     public async Task UpdateLibraryFolderId(MediaFile mediaFile, int libraryFolderId)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
         mediaFile.LibraryFolderId = libraryFolderId;
         await dbContext.Connection.ExecuteAsync(
             "UPDATE MediaFile SET LibraryFolderId = @LibraryFolderId WHERE Id = @Id",
@@ -208,7 +200,7 @@ public class LibraryRepository : ILibraryRepository
 
     public async Task UpdatePath(LibraryPath libraryPath, string normalizedLibraryPath)
     {
-        await using TvContext dbContext = await _dbContextFactory.CreateDbContextAsync();
+        await using TvContext dbContext = await dbContextFactory.CreateDbContextAsync();
         libraryPath.Path = normalizedLibraryPath;
         await dbContext.Connection.ExecuteAsync(
             "UPDATE LibraryPath SET Path = @Path WHERE Id = @Id",

ErsatzTV.Infrastructure/Data/Repositories/MediaCollectionRepository.cs

@@ -1087,7 +1087,10 @@ public class MediaCollectionRepository : IMediaCollectionRepository
                 .AsNoTracking()
                 .SelectOneAsync(a => a.Id, a => a.Id == emptyCollection.MediaItemId.Value, cancellationToken)
                 .MapT(s => s.ShowMetadata.Head().Title),
-            // TODO: get playlist name
+            CollectionType.Playlist => await dbContext.Playlists
+                .AsNoTracking()
+                .SelectOneAsync(p => p.Id, p => p.Id == emptyCollection.PlaylistId.Value, cancellationToken)
+                .MapT(p => p.Name),
             _ => None
         };
     }

ErsatzTV.Infrastructure/Data/Repositories/TemplateDataRepository.cs

@@ -1,8 +1,8 @@
 using System.Globalization;
+using System.IO.Abstractions;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Extensions;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Metadata;
 using ErsatzTV.Infrastructure.Epg;
@@ -12,7 +12,7 @@ using Microsoft.EntityFrameworkCore;
 
 namespace ErsatzTV.Infrastructure.Data.Repositories;
 
-public class TemplateDataRepository(ILocalFileSystem localFileSystem, IDbContextFactory<TvContext> dbContextFactory)
+public class TemplateDataRepository(IFileSystem fileSystem, IDbContextFactory<TvContext> dbContextFactory)
     : ITemplateDataRepository
 {
     public async Task<Option<Dictionary<string, object>>> GetMediaItemTemplateData(
@@ -65,9 +65,9 @@ public class TemplateDataRepository(ILocalFileSystem localFileSystem, IDbContext
             }
 
             string targetFile = Path.Combine(FileSystemLayout.ChannelGuideCacheFolder, $"{channelNumber}.xml");
-            if (localFileSystem.FileExists(targetFile))
+            if (fileSystem.File.Exists(targetFile))
             {
-                await using FileStream stream = File.OpenRead(targetFile);
+                await using FileSystemStream stream = fileSystem.File.OpenRead(targetFile);
                 List<EpgProgramme> xmlProgrammes = EpgReader.FindProgrammesAt(stream, time, count);
                 var result = new List<Dictionary<string, object>>();
 

ErsatzTV.Infrastructure/ErsatzTV.Infrastructure.csproj

@@ -16,6 +16,7 @@
         <PackageReference Include="EFCore.BulkExtensions" Version="9.0.2" />
         <PackageReference Include="Elastic.Clients.Elasticsearch" Version="9.2.1" />
         <PackageReference Include="Jint" Version="4.4.2" />
+        <PackageReference Include="JsonSchema.Net" Version="7.4.0" />
         <PackageReference Include="Lucene.Net" Version="4.8.0-beta00017" />
         <PackageReference Include="Lucene.Net.Analysis.Common" Version="4.8.0-beta00017" />
         <PackageReference Include="Lucene.Net.QueryParser" Version="4.8.0-beta00017" />

ErsatzTV.Infrastructure/FFmpeg/MpegTsScriptService.cs

@@ -1,4 +1,5 @@
 using System.Collections.Concurrent;
+using System.IO.Abstractions;
 using System.Runtime.InteropServices;
 using CliWrap;
 using ErsatzTV.Core;
@@ -15,6 +16,7 @@ using YamlDotNet.Serialization.NamingConventions;
 namespace ErsatzTV.Infrastructure.FFmpeg;
 
 public class MpegTsScriptService(
+    IFileSystem fileSystem,
     ILocalFileSystem localFileSystem,
     ITempFilePool tempFilePool,
     ILogger<MpegTsScriptService> logger) : IMpegTsScriptService
@@ -26,9 +28,9 @@ public class MpegTsScriptService(
         foreach (string folder in localFileSystem.ListSubdirectories(FileSystemLayout.MpegTsScriptsFolder))
         {
             string definition = Path.Combine(folder, "mpegts.yml");
-            if (!Scripts.ContainsKey(folder) && localFileSystem.FileExists(definition))
+            if (!Scripts.ContainsKey(folder) && fileSystem.File.Exists(definition))
             {
-                Option<MpegTsScript> maybeScript = FromYaml(await localFileSystem.ReadAllText(definition));
+                Option<MpegTsScript> maybeScript = FromYaml(await fileSystem.File.ReadAllTextAsync(definition));
                 foreach (var script in maybeScript)
                 {
                     script.Id = Path.GetFileName(folder);
@@ -94,7 +96,7 @@ public class MpegTsScriptService(
         string channelName,
         string ffmpegPath)
     {
-        string script = await localFileSystem.ReadAllText(fileName);
+        string script = await fileSystem.File.ReadAllTextAsync(fileName);
         try
         {
             var data = new Dictionary<string, string>

ErsatzTV.Infrastructure/Images/ImageCache.cs

@@ -1,5 +1,6 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
+using System.IO.Abstractions;
 using System.Security.Cryptography;
 using System.Text;
 using Blurhash.SkiaSharp;
@@ -14,27 +15,18 @@ using SkiaSharp;
 namespace ErsatzTV.Infrastructure.Images;
 
 [SuppressMessage("Security", "CA5350:Do Not Use Weak Cryptographic Algorithms")]
-public class ImageCache : IImageCache
+public class ImageCache(IFileSystem fileSystem, ILocalFileSystem localFileSystem, ITempFilePool tempFilePool)
+    : IImageCache
 {
     private static readonly SHA1 Crypto;
-    private readonly ILocalFileSystem _localFileSystem;
-    private readonly ITempFilePool _tempFilePool;
 
     static ImageCache() => Crypto = SHA1.Create();
 
-    public ImageCache(
-        ILocalFileSystem localFileSystem,
-        ITempFilePool tempFilePool)
-    {
-        _localFileSystem = localFileSystem;
-        _tempFilePool = tempFilePool;
-    }
-
     public async Task<Either<BaseError, string>> SaveArtworkToCache(Stream stream, ArtworkKind artworkKind)
     {
         try
         {
-            string tempFileName = _tempFilePool.GetNextTempFile(TempFileCategory.CachedArtwork);
+            string tempFileName = tempFilePool.GetNextTempFile(TempFileCategory.CachedArtwork);
             // ReSharper disable once UseAwaitUsing
             using (var fs = new FileStream(tempFileName, FileMode.OpenOrCreate, FileAccess.Write))
             {
@@ -63,7 +55,7 @@ public class ImageCache : IImageCache
                 Directory.CreateDirectory(baseFolder);
             }
 
-            await _localFileSystem.CopyFile(tempFileName, target);
+            await localFileSystem.CopyFile(tempFileName, target);
 
             return hex;
         }
@@ -77,7 +69,7 @@ public class ImageCache : IImageCache
     {
         try
         {
-            var filenameKey = $"{path}:{_localFileSystem.GetLastWriteTime(path).ToFileTimeUtc()}";
+            var filenameKey = $"{path}:{localFileSystem.GetLastWriteTime(path).ToFileTimeUtc()}";
             byte[] hash = Crypto.ComputeHash(Encoding.UTF8.GetBytes(filenameKey));
             string hex = Convert.ToHexString(hash);
             string subfolder = hex[..2];
@@ -90,7 +82,7 @@ public class ImageCache : IImageCache
                 _ => FileSystemLayout.LegacyImageCacheFolder
             };
             string target = Path.Combine(baseFolder, hex);
-            Either<BaseError, Unit> maybeResult = await _localFileSystem.CopyFile(path, target);
+            Either<BaseError, Unit> maybeResult = await localFileSystem.CopyFile(path, target);
             return maybeResult.Match<Either<BaseError, string>>(
                 _ => hex,
                 error => error);
@@ -159,14 +151,14 @@ public class ImageCache : IImageCache
     {
         byte[] bytes = Encoding.UTF8.GetBytes(blurHash);
         string base64 = Convert.ToBase64String(bytes).Replace("+", "_").Replace("/", "-").Replace("=", "");
-        string targetFile = GetPathForImage(base64, ArtworkKind.Poster, targetSize.Height);
+        string targetFile = GetPathForImage(base64, ArtworkKind.Poster, targetSize.Height) ?? string.Empty;
-        if (!_localFileSystem.FileExists(targetFile))
+        if (!fileSystem.File.Exists(targetFile))
         {
             string folder = Path.GetDirectoryName(targetFile);
-            _localFileSystem.EnsureFolderExists(folder);
+            localFileSystem.EnsureFolderExists(folder);
 
             // ReSharper disable once ConvertToUsingDeclaration
-            using (FileStream fs = File.OpenWrite(targetFile))
+            using (FileSystemStream fs = fileSystem.File.OpenWrite(targetFile))
             {
                 using (SKBitmap image = Blurhasher.Decode(blurHash, targetSize.Width, targetSize.Height))
                 {

ErsatzTV.Infrastructure/Metadata/LocalStatisticsProvider.cs

@@ -1,6 +1,7 @@
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
+using System.IO.Abstractions;
 using System.Text;
 using System.Text.RegularExpressions;
 using Bugsnag;
@@ -25,15 +26,18 @@ public partial class LocalStatisticsProvider : ILocalStatisticsProvider
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILogger<LocalStatisticsProvider> _logger;
     private readonly IMetadataRepository _metadataRepository;
+    private readonly IFileSystem _fileSystem;
 
     public LocalStatisticsProvider(
         IMetadataRepository metadataRepository,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         IClient client,
         IHardwareCapabilitiesFactory hardwareCapabilitiesFactory,
         ILogger<LocalStatisticsProvider> logger)
     {
         _metadataRepository = metadataRepository;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _client = client;
         _hardwareCapabilitiesFactory = hardwareCapabilitiesFactory;
@@ -146,7 +150,7 @@ public partial class LocalStatisticsProvider : ILocalStatisticsProvider
             }
 
             if (filePath.StartsWith("http", StringComparison.OrdinalIgnoreCase) ||
-                !_localFileSystem.FileExists(filePath))
+                !_fileSystem.File.Exists(filePath))
             {
                 _logger.LogDebug("Skipping interlaced ratio check for remote content");
                 return Option<double>.None;

ErsatzTV.Infrastructure/Scheduling/SequentialScheduleValidator.cs

@@ -1,5 +1,7 @@
 using System.Globalization;
+using System.IO.Abstractions;
 using System.Text.Json;
+using System.Text.Json.Nodes;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Interfaces.Scheduling;
 using Microsoft.Extensions.Logging;
@@ -8,30 +10,30 @@ using Newtonsoft.Json.Linq;
 using Newtonsoft.Json.Schema;
 using YamlDotNet.RepresentationModel;
 using JsonSerializer = System.Text.Json.JsonSerializer;
+using JsonSchemaNet = Json.Schema;
 
 namespace ErsatzTV.Infrastructure.Scheduling;
 
-public class SequentialScheduleValidator(ILogger<SequentialScheduleValidator> logger) : ISequentialScheduleValidator
+public class SequentialScheduleValidator(IFileSystem fileSystem, ILogger<SequentialScheduleValidator> logger)
+    : ISequentialScheduleValidator
 {
     public async Task<bool> ValidateSchedule(string yaml, bool isImport)
     {
         try
         {
-            string schemaFileName = Path.Combine(
+            string schemaFileName = GetSchemaPath(isImport);
-                FileSystemLayout.ResourcesCacheFolder,
+            string schemaText = await fileSystem.File.ReadAllTextAsync(schemaFileName);
-                isImport ? "sequential-schedule-import.schema.json" : "sequential-schedule.schema.json");
+
-            using StreamReader sr = File.OpenText(schemaFileName);
+            JsonSchemaNet.JsonSchema schema = JsonSchemaNet.JsonSchema.FromText(schemaText);
-            await using var reader = new JsonTextReader(sr);
+
-            var schema = JSchema.Load(reader);
+            string jsonString = ConvertYamlToJsonString(yaml);
+            JsonNode jsonNode = JsonNode.Parse(jsonString);
 
-            using var textReader = new StringReader(yaml);
+            JsonSchemaNet.EvaluationResults result = schema.Evaluate(jsonNode);
-            var yamlStream = new YamlStream();
-            yamlStream.Load(textReader);
-            var schedule = JObject.Parse(Convert(yamlStream));
 
-            if (!schedule.IsValid(schema, out IList<string> errorMessages))
+            if (!result.IsValid)
             {
-                logger.LogWarning("Failed to validate sequential schedule definition: {ErrorMessages}", errorMessages);
+                logger.LogWarning("Sequential schedule definition failed validation");
                 return false;
             }
 
@@ -47,30 +49,27 @@ public class SequentialScheduleValidator(ILogger<SequentialScheduleValidator> lo
 
     public string ToJson(string yaml)
     {
-        using var textReader = new StringReader(yaml);
+        string jsonString = ConvertYamlToJsonString(yaml);
-        var yamlStream = new YamlStream();
+        var schedule = JObject.Parse(jsonString);
-        yamlStream.Load(textReader);
+
-        var schedule = JObject.Parse(Convert(yamlStream));
         string formatted = JsonConvert.SerializeObject(schedule, Formatting.Indented);
         string[] lines = formatted.Split('\n');
         return string.Join('\n', lines.Select((line, index) => $"{index + 1,4}: {line}"));
     }
 
+    // limited to 1000/hr, but only called manually from UI
     public async Task<IList<string>> GetValidationMessages(string yaml, bool isImport)
     {
         try
         {
-            string schemaFileName = Path.Combine(
+            string schemaFileName = GetSchemaPath(isImport);
-                FileSystemLayout.ResourcesCacheFolder,
+
-                isImport ? "sequential-schedule-import.schema.json" : "sequential-schedule.schema.json");
+            using StreamReader sr = fileSystem.File.OpenText(schemaFileName);
-            using StreamReader sr = File.OpenText(schemaFileName);
             await using var reader = new JsonTextReader(sr);
             var schema = JSchema.Load(reader);
 
-            using var textReader = new StringReader(yaml);
+            string jsonString = ConvertYamlToJsonString(yaml);
-            var yamlStream = new YamlStream();
+            var schedule = JObject.Parse(jsonString);
-            yamlStream.Load(textReader);
-            var schedule = JObject.Parse(Convert(yamlStream));
 
             return schedule.IsValid(schema, out IList<string> errorMessages) ? [] : errorMessages;
         }
@@ -80,13 +79,24 @@ public class SequentialScheduleValidator(ILogger<SequentialScheduleValidator> lo
         }
     }
 
-    private static string Convert(YamlStream yamlStream)
+    private static string ConvertYamlToJsonString(string yaml)
     {
+        using var textReader = new StringReader(yaml);
+        var yamlStream = new YamlStream();
+        yamlStream.Load(textReader);
+
         var visitor = new YamlToJsonVisitor();
         yamlStream.Accept(visitor);
         return JsonConvert.SerializeObject(JsonConvert.DeserializeObject(visitor.JsonString), Formatting.Indented);
     }
 
+    private static string GetSchemaPath(bool isImport)
+    {
+        return Path.Combine(
+            FileSystemLayout.ResourcesCacheFolder,
+            isImport ? "sequential-schedule-import.schema.json" : "sequential-schedule.schema.json");
+    }
+
     private sealed class YamlToJsonVisitor : IYamlVisitor
     {
         private readonly JsonSerializerOptions _options = new() { WriteIndented = false };

ErsatzTV.Infrastructure/Streaming/ExternalJsonPlayoutItemProvider.cs

@@ -1,4 +1,5 @@
 using System.Globalization;
+using System.IO.Abstractions;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Domain.Filler;
@@ -19,7 +20,7 @@ namespace ErsatzTV.Infrastructure.Streaming;
 public class ExternalJsonPlayoutItemProvider : IExternalJsonPlayoutItemProvider
 {
     private readonly IDbContextFactory<TvContext> _dbContextFactory;
-    private readonly ILocalFileSystem _localFileSystem;
+    private readonly IFileSystem _fileSystem;
     private readonly ILocalStatisticsProvider _localStatisticsProvider;
     private readonly ILogger<ExternalJsonPlayoutItemProvider> _logger;
     private readonly IPlexPathReplacementService _plexPathReplacementService;
@@ -28,7 +29,7 @@ public class ExternalJsonPlayoutItemProvider : IExternalJsonPlayoutItemProvider
 
     public ExternalJsonPlayoutItemProvider(
         IDbContextFactory<TvContext> dbContextFactory,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         IPlexPathReplacementService plexPathReplacementService,
         IPlexServerApiClient plexServerApiClient,
         IPlexSecretStore plexSecretStore,
@@ -36,7 +37,7 @@ public class ExternalJsonPlayoutItemProvider : IExternalJsonPlayoutItemProvider
         ILogger<ExternalJsonPlayoutItemProvider> logger)
     {
         _dbContextFactory = dbContextFactory;
-        _localFileSystem = localFileSystem;
+        _fileSystem = fileSystem;
         _plexPathReplacementService = plexPathReplacementService;
         _plexServerApiClient = plexServerApiClient;
         _plexSecretStore = plexSecretStore;
@@ -62,7 +63,7 @@ public class ExternalJsonPlayoutItemProvider : IExternalJsonPlayoutItemProvider
             if (playout.ScheduleKind == PlayoutScheduleKind.ExternalJson)
             {
                 // json file must exist
-                if (_localFileSystem.FileExists(playout.ScheduleFile))
+                if (_fileSystem.File.Exists(playout.ScheduleFile))
                 {
                     return await GetExternalJsonPlayoutItem(dbContext, playout, now, ffprobePath, cancellationToken);
                 }
@@ -86,7 +87,7 @@ public class ExternalJsonPlayoutItemProvider : IExternalJsonPlayoutItemProvider
         CancellationToken cancellationToken)
     {
         Option<ExternalJsonChannel> maybeChannel = JsonConvert.DeserializeObject<ExternalJsonChannel>(
-            await File.ReadAllTextAsync(playout.ScheduleFile, cancellationToken));
+            await _fileSystem.File.ReadAllTextAsync(playout.ScheduleFile, cancellationToken));
 
         // must deserialize channel from json
         foreach (ExternalJsonChannel channel in maybeChannel)
@@ -139,7 +140,7 @@ public class ExternalJsonPlayoutItemProvider : IExternalJsonPlayoutItemProvider
                 program.File,
                 cancellationToken);
 
-            if (_localFileSystem.FileExists(localPath))
+            if (_fileSystem.File.Exists(localPath))
             {
                 return await StreamLocally(startTime, program, ffprobePath, localPath);
             }

ErsatzTV.Infrastructure/Streaming/Graphics/GraphicsElementLoader.cs

@@ -1,8 +1,8 @@
+using System.IO.Abstractions;
 using System.Text;
 using System.Text.RegularExpressions;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Graphics;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Interfaces.Streaming;
 using ErsatzTV.Core.Metadata;
@@ -18,7 +18,7 @@ namespace ErsatzTV.Infrastructure.Streaming.Graphics;
 
 public partial class GraphicsElementLoader(
     TemplateFunctions templateFunctions,
-    ILocalFileSystem localFileSystem,
+    IFileSystem fileSystem,
     ITemplateDataRepository templateDataRepository,
     ILogger<GraphicsElementLoader> logger)
     : IGraphicsElementLoader
@@ -147,7 +147,7 @@ public partial class GraphicsElementLoader(
     {
         try
         {
-            string yaml = await localFileSystem.ReadAllText(fileName);
+            string yaml = await fileSystem.File.ReadAllTextAsync(fileName, cancellationToken);
             var template = Template.Parse(yaml);
 
             var builder = new StringBuilder();
@@ -187,7 +187,7 @@ public partial class GraphicsElementLoader(
 
         foreach (var reference in elementsWithEpg)
         {
-            foreach (string line in await localFileSystem.ReadAllLines(reference.GraphicsElement.Path))
+            foreach (string line in await fileSystem.File.ReadAllLinesAsync(reference.GraphicsElement.Path))
             {
                 Match match = EpgEntriesRegex().Match(line);
                 if (!match.Success || !int.TryParse(match.Groups[1].Value, out int value))
@@ -257,7 +257,7 @@ public partial class GraphicsElementLoader(
 
     private async Task<Option<string>> GetTemplatedYaml(string fileName, Dictionary<string, object> variables)
     {
-        string yaml = await localFileSystem.ReadAllText(fileName);
+        string yaml = await fileSystem.File.ReadAllTextAsync(fileName);
         try
         {
             var scriptObject = new ScriptObject();

ErsatzTV.Scanner.Tests/Core/FFmpeg/TranscodingTests.cs

@@ -34,6 +34,7 @@ using NSubstitute;
 using NUnit.Framework;
 using Serilog;
 using Shouldly;
+using Testably.Abstractions.Testing;
 using MediaStream = ErsatzTV.Core.Domain.MediaStream;
 
 namespace ErsatzTV.Scanner.Tests.Core.FFmpeg;
@@ -235,8 +236,10 @@ public class TranscodingTests
         StreamingMode streamingMode)
     {
         var localFileSystem = new LocalFileSystem(
+            new MockFileSystem(),
             Substitute.For<IClient>(),
             LoggerFactory.CreateLogger<LocalFileSystem>());
+        var fileSystem = new MockFileSystem();
         var tempFilePool = new TempFilePool();
 
         ImageCache mockImageCache = Substitute.For<ImageCache>(localFileSystem, tempFilePool);
@@ -353,7 +356,8 @@ public class TranscodingTests
 
         var localStatisticsProvider = new LocalStatisticsProvider(
             metadataRepository,
-            new LocalFileSystem(Substitute.For<IClient>(), LoggerFactory.CreateLogger<LocalFileSystem>()),
+            fileSystem,
+            localFileSystem,
             Substitute.For<IClient>(),
             Substitute.For<IHardwareCapabilitiesFactory>(),
             LoggerFactory.CreateLogger<LocalStatisticsProvider>());
@@ -460,6 +464,12 @@ public class TranscodingTests
             // do nothing
         }
 
+        var localFileSystem = new LocalFileSystem(
+            new MockFileSystem(),
+            Substitute.For<IClient>(),
+            LoggerFactory.CreateLogger<LocalFileSystem>());
+        var fileSystem = new MockFileSystem();
+
         string file = fileToTest;
         if (string.IsNullOrWhiteSpace(file))
         {
@@ -503,7 +513,8 @@ public class TranscodingTests
 
         var localStatisticsProvider = new LocalStatisticsProvider(
             metadataRepository,
-            new LocalFileSystem(Substitute.For<IClient>(), LoggerFactory.CreateLogger<LocalFileSystem>()),
+            fileSystem,
+            localFileSystem,
             Substitute.For<IClient>(),
             Substitute.For<IHardwareCapabilitiesFactory>(),
             LoggerFactory.CreateLogger<LocalStatisticsProvider>());
@@ -669,9 +680,6 @@ public class TranscodingTests
             SubtitleMode = subtitleMode
         };
 
-        var localFileSystem = new LocalFileSystem(
-            Substitute.For<IClient>(),
-            LoggerFactory.CreateLogger<LocalFileSystem>());
         var tempFilePool = new TempFilePool();
 
         ImageCache mockImageCache = Substitute.For<ImageCache>(localFileSystem, tempFilePool);

ErsatzTV.Scanner.Tests/Core/Fakes/FakeLocalFileSystem.cs

@@ -1,88 +0,0 @@
-using ErsatzTV.Core;
-using ErsatzTV.Core.Domain;
-using ErsatzTV.Core.Interfaces.Metadata;
-
-namespace ErsatzTV.Scanner.Tests.Core.Fakes;
-
-public class FakeLocalFileSystem : ILocalFileSystem
-{
-    private readonly List<FakeFileEntry> _files;
-    private readonly List<FakeFolderEntry> _folders;
-
-    public FakeLocalFileSystem(List<FakeFileEntry> files) : this(files, new List<FakeFolderEntry>())
-    {
-    }
-
-    public FakeLocalFileSystem(List<FakeFileEntry> files, List<FakeFolderEntry> folders)
-    {
-        _files = files;
-
-        var allFolders = new List<string>(folders.Map(f => f.Path));
-        foreach (FakeFileEntry file in _files)
-        {
-            List<DirectoryInfo> moreFolders =
-                Split(new DirectoryInfo(Path.GetDirectoryName(file.Path) ?? string.Empty));
-            allFolders.AddRange(moreFolders.Map(i => i.FullName));
-        }
-
-        _folders = allFolders.Distinct().Map(f => new FakeFolderEntry(f)).ToList();
-    }
-
-    public Unit EnsureFolderExists(string folder) => Unit.Default;
-
-    public DateTime GetLastWriteTime(string path) =>
-        Optional(_files.SingleOrDefault(f => f.Path == path))
-            .Map(f => f.LastWriteTime)
-            .IfNone(SystemTime.MinValueUtc);
-
-    public bool IsLibraryPathAccessible(LibraryPath libraryPath) =>
-        _folders.Any(f => f.Path == libraryPath.Path);
-
-    public IEnumerable<string> ListSubdirectories(string folder) =>
-        _folders.Map(f => f.Path).Filter(f => f.StartsWith(folder) && Directory.GetParent(f)?.FullName == folder);
-
-    public IEnumerable<string> ListFiles(string folder) =>
-        _files.Map(f => f.Path).Filter(f => Path.GetDirectoryName(f) == folder);
-
-    // TODO: this isn't accurate, need to use search pattern
-    public IEnumerable<string> ListFiles(string folder, string searchPattern) =>
-        _files.Map(f => f.Path).Filter(f => Path.GetDirectoryName(f) == folder);
-
-    public IEnumerable<string> ListFiles(string folder, params string[] searchPatterns) =>
-        _files.Map(f => f.Path).Filter(f => Path.GetDirectoryName(f) == folder);
-
-    public bool FileExists(string path) => _files.Any(f => f.Path == path);
-    public bool FolderExists(string folder) => false;
-
-    public Task<Either<BaseError, Unit>> CopyFile(string source, string destination) =>
-        Task.FromResult(Right<BaseError, Unit>(Unit.Default));
-
-    public Unit EmptyFolder(string folder) => Unit.Default;
-    public Task<string> ReadAllText(string path) => throw new NotImplementedException();
-    public Task<string[]> ReadAllLines(string path) => throw new NotImplementedException();
-    public Task<byte[]> GetHash(string path) => throw new NotImplementedException();
-
-    public string GetCustomOrDefaultFile(string folder, string file)
-    {
-        string path = Path.Combine(folder, file);
-        return FileExists(path) ? path : Path.Combine(folder, $"_{file}");
-    }
-
-    private static List<DirectoryInfo> Split(DirectoryInfo path)
-    {
-        var result = new List<DirectoryInfo>();
-        if (path == null || string.IsNullOrWhiteSpace(path.FullName))
-        {
-            return result;
-        }
-
-        if (path.Parent != null)
-        {
-            result.AddRange(Split(path.Parent));
-        }
-
-        result.Add(path);
-
-        return result;
-    }
-}

ErsatzTV.Scanner.Tests/Core/Metadata/LocalSubtitlesProviderTests.cs

@@ -1,12 +1,16 @@
 using System.Globalization;
+using Bugsnag;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Repositories;
+using ErsatzTV.Core.Metadata;
 using ErsatzTV.Scanner.Core.Metadata;
 using ErsatzTV.Scanner.Tests.Core.Fakes;
 using Microsoft.Extensions.Logging;
 using NSubstitute;
 using NUnit.Framework;
 using Shouldly;
+using Testably.Abstractions.Testing;
+using Testably.Abstractions.Testing.Initializer;
 
 namespace ErsatzTV.Scanner.Tests.Core.Metadata;
 
@@ -46,10 +50,17 @@ public class LocalSubtitlesProviderTests
             new(@"/Movies/Avatar (2009)/Avatar (2009).DE.SDH.FORCED.SRT")
         };
 
+        var fileSystem = new MockFileSystem();
+        IFileSystemInitializer<MockFileSystem> init = fileSystem.Initialize();
+        foreach (var file in fakeFiles)
+        {
+            init.WithFile(file.Path);
+        }
+
         var provider = new LocalSubtitlesProvider(
             Substitute.For<IMediaItemRepository>(),
             Substitute.For<IMetadataRepository>(),
-            new FakeLocalFileSystem(fakeFiles),
+            new LocalFileSystem(fileSystem, Substitute.For<IClient>(), Substitute.For<ILogger<LocalFileSystem>>()),
             Substitute.For<ILogger<LocalSubtitlesProvider>>());
 
         List<Subtitle> result = provider.LocateExternalSubtitles(
@@ -91,10 +102,17 @@ public class LocalSubtitlesProviderTests
             new(@"/Movies/Avatar (2009)/Avatar (2009).DE.SDH.FORCED.SRT")
         };
 
+        var fileSystem = new MockFileSystem();
+        IFileSystemInitializer<MockFileSystem> init = fileSystem.Initialize();
+        foreach (var file in fakeFiles)
+        {
+            init.WithFile(file.Path);
+        }
+
         var provider = new LocalSubtitlesProvider(
             Substitute.For<IMediaItemRepository>(),
             Substitute.For<IMetadataRepository>(),
-            new FakeLocalFileSystem(fakeFiles),
+            new LocalFileSystem(fileSystem, Substitute.For<IClient>(), Substitute.For<ILogger<LocalFileSystem>>()),
             Substitute.For<ILogger<LocalSubtitlesProvider>>());
 
         List<Subtitle> result = provider.LocateExternalSubtitles(

ErsatzTV.Scanner.Tests/Core/Metadata/MovieFolderScannerTests.cs

@@ -17,16 +17,14 @@ using NSubstitute;
 using NUnit.Framework;
 using Serilog;
 using Shouldly;
+using Testably.Abstractions.Testing;
+using Testably.Abstractions.Testing.Initializer;
 
 namespace ErsatzTV.Scanner.Tests.Core.Metadata;
 
 [TestFixture]
 public class MovieFolderScannerTests
 {
-    private static readonly string BadFakeRoot = RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
-        ? @"C:\Movies-That-Dont-Exist"
-        : @"/movies-that-dont-exist";
-
     private static readonly string FakeRoot = RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
         ? @"C:\Movies"
         : "/movies";
@@ -718,10 +716,19 @@ public class MovieFolderScannerTests
             await _mediaItemRepository.Received(1).FlagFileNotFound(libraryPath, oldMoviePath);
         }
 
-        private MovieFolderScanner GetService(params FakeFileEntry[] files) =>
+        private MovieFolderScanner GetService(params FakeFileEntry[] files)
-            new(
+        {
+            var fileSystem = new MockFileSystem();
+            IFileSystemInitializer<MockFileSystem> init = fileSystem.Initialize();
+            foreach (var file in files)
+            {
+                init.WithFile(file.Path).Which(f => f.File.LastWriteTime = file.LastWriteTime);
+            }
+
+            return new MovieFolderScanner(
                 _scannerProxy,
-                new FakeLocalFileSystem([..files]),
+                fileSystem,
+                new LocalFileSystem(fileSystem, Substitute.For<IClient>(), Substitute.For<ILogger<LocalFileSystem>>()),
                 _movieRepository,
                 _localStatisticsProvider,
                 Substitute.For<ILocalSubtitlesProvider>(),
@@ -735,11 +742,21 @@ public class MovieFolderScannerTests
                 Substitute.For<ITempFilePool>(),
                 Substitute.For<IClient>(),
                 Logger);
+        }
 
-        private MovieFolderScanner GetService(params FakeFolderEntry[] folders) =>
+        private MovieFolderScanner GetService(params FakeFolderEntry[] folders)
-            new(
+        {
+            var fileSystem = new MockFileSystem();
+            IFileSystemInitializer<MockFileSystem> init = fileSystem.Initialize();
+            foreach (var folder in folders)
+            {
+                init.WithSubdirectory(folder.Path);
+            }
+
+            return new MovieFolderScanner(
                 _scannerProxy,
-                new FakeLocalFileSystem([], [..folders]),
+                fileSystem,
+                new LocalFileSystem(fileSystem, Substitute.For<IClient>(), Substitute.For<ILogger<LocalFileSystem>>()),
                 _movieRepository,
                 _localStatisticsProvider,
                 Substitute.For<ILocalSubtitlesProvider>(),
@@ -753,5 +770,6 @@ public class MovieFolderScannerTests
                 Substitute.For<ITempFilePool>(),
                 Substitute.For<IClient>(),
                 Logger);
+        }
     }
 }

ErsatzTV.Scanner.Tests/ErsatzTV.Scanner.Tests.csproj

@@ -23,6 +23,7 @@
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>
         <PackageReference Include="Shouldly" Version="4.3.0" />
+        <PackageReference Include="Testably.Abstractions.Testing" Version="5.0.0" />
     </ItemGroup>
 
     <ItemGroup>

ErsatzTV.Scanner/Core/Emby/EmbyMovieLibraryScanner.cs

@@ -1,9 +1,9 @@
-using ErsatzTV.Core;
+using System.IO.Abstractions;
+using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Emby;
 using ErsatzTV.Core.Extensions;
 using ErsatzTV.Core.Interfaces.Emby;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Metadata;
 using ErsatzTV.Scanner.Core.Interfaces;
@@ -29,13 +29,13 @@ public class EmbyMovieLibraryScanner :
         IMediaSourceRepository mediaSourceRepository,
         IEmbyMovieRepository embyMovieRepository,
         IEmbyPathReplacementService pathReplacementService,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ILocalChaptersProvider localChaptersProvider,
         IMetadataRepository metadataRepository,
         ILogger<EmbyMovieLibraryScanner> logger)
         : base(
             scannerProxy,
-            localFileSystem,
+            fileSystem,
             localChaptersProvider,
             metadataRepository,
             logger)

ErsatzTV.Scanner/Core/Emby/EmbyTelevisionLibraryScanner.cs

@@ -1,10 +1,10 @@
-using ErsatzTV.Core;
+using System.IO.Abstractions;
+using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Emby;
 using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Extensions;
 using ErsatzTV.Core.Interfaces.Emby;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Metadata;
 using ErsatzTV.Scanner.Core.Interfaces;
@@ -30,13 +30,13 @@ public class EmbyTelevisionLibraryScanner : MediaServerTelevisionLibraryScanner<
         IMediaSourceRepository mediaSourceRepository,
         IEmbyTelevisionRepository televisionRepository,
         IEmbyPathReplacementService pathReplacementService,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ILocalChaptersProvider localChaptersProvider,
         IMetadataRepository metadataRepository,
         ILogger<EmbyTelevisionLibraryScanner> logger)
         : base(
             scannerProxy,
-            localFileSystem,
+            fileSystem,
             localChaptersProvider,
             metadataRepository,
             logger)

ErsatzTV.Scanner/Core/Jellyfin/JellyfinMovieLibraryScanner.cs

@@ -1,8 +1,8 @@
-using ErsatzTV.Core;
+using System.IO.Abstractions;
+using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Extensions;
 using ErsatzTV.Core.Interfaces.Jellyfin;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Jellyfin;
 using ErsatzTV.Core.Metadata;
@@ -29,13 +29,13 @@ public class JellyfinMovieLibraryScanner :
         IJellyfinMovieRepository jellyfinMovieRepository,
         IJellyfinPathReplacementService pathReplacementService,
         IMediaSourceRepository mediaSourceRepository,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ILocalChaptersProvider localChaptersProvider,
         IMetadataRepository metadataRepository,
         ILogger<JellyfinMovieLibraryScanner> logger)
         : base(
             scannerProxy,
-            localFileSystem,
+            fileSystem,
             localChaptersProvider,
             metadataRepository,
             logger)

ErsatzTV.Scanner/Core/Jellyfin/JellyfinTelevisionLibraryScanner.cs

@@ -1,9 +1,9 @@
-using ErsatzTV.Core;
+using System.IO.Abstractions;
+using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Extensions;
 using ErsatzTV.Core.Interfaces.Jellyfin;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Jellyfin;
 using ErsatzTV.Core.Metadata;
@@ -31,13 +31,13 @@ public class JellyfinTelevisionLibraryScanner : MediaServerTelevisionLibraryScan
         IMediaSourceRepository mediaSourceRepository,
         IJellyfinTelevisionRepository televisionRepository,
         IJellyfinPathReplacementService pathReplacementService,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ILocalChaptersProvider localChaptersProvider,
         IMetadataRepository metadataRepository,
         ILogger<JellyfinTelevisionLibraryScanner> logger)
         : base(
             scannerProxy,
-            localFileSystem,
+            fileSystem,
             localChaptersProvider,
             metadataRepository,
             logger)

ErsatzTV.Scanner/Core/Metadata/ImageFolderScanner.cs

@@ -1,4 +1,5 @@
 using System.Collections.Immutable;
+using System.IO.Abstractions;
 using Bugsnag;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
@@ -22,6 +23,7 @@ public class ImageFolderScanner : LocalFolderScanner, IImageFolderScanner
     private readonly IImageRepository _imageRepository;
     private readonly ILibraryRepository _libraryRepository;
     private readonly IScannerProxy _scannerProxy;
+    private readonly IFileSystem _fileSystem;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILocalMetadataProvider _localMetadataProvider;
     private readonly ILogger<ImageFolderScanner> _logger;
@@ -29,6 +31,7 @@ public class ImageFolderScanner : LocalFolderScanner, IImageFolderScanner
 
     public ImageFolderScanner(
         IScannerProxy scannerProxy,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         ILocalStatisticsProvider localStatisticsProvider,
         ILocalMetadataProvider localMetadataProvider,
@@ -41,7 +44,7 @@ public class ImageFolderScanner : LocalFolderScanner, IImageFolderScanner
         ITempFilePool tempFilePool,
         IClient client,
         ILogger<ImageFolderScanner> logger) : base(
-        localFileSystem,
+        fileSystem,
         localStatisticsProvider,
         metadataRepository,
         mediaItemRepository,
@@ -52,6 +55,7 @@ public class ImageFolderScanner : LocalFolderScanner, IImageFolderScanner
         logger)
     {
         _scannerProxy = scannerProxy;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _localMetadataProvider = localMetadataProvider;
         _imageRepository = imageRepository;
@@ -226,7 +230,7 @@ public class ImageFolderScanner : LocalFolderScanner, IImageFolderScanner
 
             foreach (string path in await _imageRepository.FindImagePaths(libraryPath))
             {
-                if (!_localFileSystem.FileExists(path))
+                if (!_fileSystem.File.Exists(path))
                 {
                     _logger.LogInformation("Flagging missing image at {Path}", path);
                     List<int> imageIds = await FlagFileNotFound(libraryPath, path);

ErsatzTV.Scanner/Core/Metadata/LocalFolderScanner.cs

@@ -1,4 +1,5 @@
 using System.Collections.Immutable;
+using System.IO.Abstractions;
 using Bugsnag;
 using CliWrap;
 using ErsatzTV.Core;
@@ -59,7 +60,7 @@ public abstract class LocalFolderScanner
 
     private readonly IImageCache _imageCache;
 
-    private readonly ILocalFileSystem _localFileSystem;
+    private readonly IFileSystem _fileSystem;
     private readonly ILocalStatisticsProvider _localStatisticsProvider;
     private readonly ILogger _logger;
     private readonly IMediaItemRepository _mediaItemRepository;
@@ -67,7 +68,7 @@ public abstract class LocalFolderScanner
     private readonly ITempFilePool _tempFilePool;
 
     protected LocalFolderScanner(
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ILocalStatisticsProvider localStatisticsProvider,
         IMetadataRepository metadataRepository,
         IMediaItemRepository mediaItemRepository,
@@ -77,7 +78,7 @@ public abstract class LocalFolderScanner
         IClient client,
         ILogger logger)
     {
-        _localFileSystem = localFileSystem;
+        _fileSystem = fileSystem;
         _localStatisticsProvider = localStatisticsProvider;
         _metadataRepository = metadataRepository;
         _mediaItemRepository = mediaItemRepository;
@@ -100,7 +101,7 @@ public abstract class LocalFolderScanner
 
             string path = version.MediaFiles.Head().Path;
 
-            if (version.DateUpdated != _localFileSystem.GetLastWriteTime(path) || version.Streams.Count == 0)
+            if (version.DateUpdated != _fileSystem.File.GetLastWriteTime(path) || version.Streams.Count == 0)
             {
                 _logger.LogDebug("Refreshing {Attribute} for {Path}", "Statistics", path);
                 Either<BaseError, bool> refreshResult =
@@ -141,7 +142,7 @@ public abstract class LocalFolderScanner
         Option<int> attachedPicIndex,
         CancellationToken cancellationToken)
     {
-        DateTime lastWriteTime = _localFileSystem.GetLastWriteTime(artworkFile);
+        DateTime lastWriteTime = _fileSystem.File.GetLastWriteTime(artworkFile);
 
         metadata.Artwork ??= new List<Artwork>();
 
@@ -311,5 +312,5 @@ public abstract class LocalFolderScanner
     protected bool ShouldIncludeFolder(string folder) =>
         !string.IsNullOrWhiteSpace(folder) &&
         !Path.GetFileName(folder).StartsWith('.') &&
-        !_localFileSystem.FileExists(Path.Combine(folder, ".etvignore"));
+        !_fileSystem.File.Exists(Path.Combine(folder, ".etvignore"));
 }

ErsatzTV.Scanner/Core/Metadata/LocalMetadataProvider.cs

@@ -1,4 +1,5 @@
-using Bugsnag;
+using System.IO.Abstractions;
+using Bugsnag;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Extensions;
@@ -22,6 +23,7 @@ public class LocalMetadataProvider : ILocalMetadataProvider
     private readonly IClient _client;
     private readonly IEpisodeNfoReader _episodeNfoReader;
     private readonly IFallbackMetadataProvider _fallbackMetadataProvider;
+    private readonly IFileSystem _fileSystem;
     private readonly IImageRepository _imageRepository;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILocalStatisticsProvider _localStatisticsProvider;
@@ -49,6 +51,7 @@ public class LocalMetadataProvider : ILocalMetadataProvider
         IImageRepository imageRepository,
         IRemoteStreamRepository remoteStreamRepository,
         IFallbackMetadataProvider fallbackMetadataProvider,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         IMovieNfoReader movieNfoReader,
         IEpisodeNfoReader episodeNfoReader,
@@ -70,6 +73,7 @@ public class LocalMetadataProvider : ILocalMetadataProvider
         _imageRepository = imageRepository;
         _remoteStreamRepository = remoteStreamRepository;
         _fallbackMetadataProvider = fallbackMetadataProvider;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _movieNfoReader = movieNfoReader;
         _episodeNfoReader = episodeNfoReader;
@@ -86,7 +90,7 @@ public class LocalMetadataProvider : ILocalMetadataProvider
     {
         string nfoFileName = Path.Combine(showFolder, "tvshow.nfo");
         Option<ShowMetadata> maybeMetadata = None;
-        if (_localFileSystem.FileExists(nfoFileName))
+        if (_fileSystem.File.Exists(nfoFileName))
         {
             maybeMetadata = await LoadTelevisionShowMetadata(nfoFileName);
         }
@@ -106,7 +110,7 @@ public class LocalMetadataProvider : ILocalMetadataProvider
     {
         string nfoFileName = Path.Combine(artistFolder, "artist.nfo");
         Option<ArtistMetadata> maybeMetadata = None;
-        if (_localFileSystem.FileExists(nfoFileName))
+        if (_fileSystem.File.Exists(nfoFileName))
         {
             maybeMetadata = await LoadArtistMetadata(nfoFileName);
         }

ErsatzTV.Scanner/Core/Metadata/LocalSubtitlesProvider.cs

@@ -10,7 +10,7 @@ namespace ErsatzTV.Scanner.Core.Metadata;
 
 public class LocalSubtitlesProvider : ILocalSubtitlesProvider
 {
-    private readonly List<CultureInfo> _languageCodes = new();
+    private readonly List<CultureInfo> _languageCodes = [];
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILogger<LocalSubtitlesProvider> _logger;
     private readonly IMediaItemRepository _mediaItemRepository;

ErsatzTV.Scanner/Core/Metadata/MediaServerMovieLibraryScanner.cs

@@ -1,10 +1,10 @@
 using System.Collections.Immutable;
+using System.IO.Abstractions;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Domain.MediaServer;
 using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Extensions;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Metadata;
 using ErsatzTV.Scanner.Core.Interfaces;
@@ -21,19 +21,19 @@ public abstract class MediaServerMovieLibraryScanner<TConnectionParameters, TLib
 {
     private readonly ILocalChaptersProvider _localChaptersProvider;
     private readonly IScannerProxy _scannerProxy;
-    private readonly ILocalFileSystem _localFileSystem;
+    private readonly IFileSystem _fileSystem;
     private readonly ILogger _logger;
     private readonly IMetadataRepository _metadataRepository;
 
     protected MediaServerMovieLibraryScanner(
         IScannerProxy scannerProxy,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ILocalChaptersProvider localChaptersProvider,
         IMetadataRepository metadataRepository,
         ILogger logger)
     {
         _scannerProxy = scannerProxy;
-        _localFileSystem = localFileSystem;
+        _fileSystem = fileSystem;
         _localChaptersProvider = localChaptersProvider;
         _metadataRepository = metadataRepository;
         _logger = logger;
@@ -167,7 +167,7 @@ public abstract class MediaServerMovieLibraryScanner<TConnectionParameters, TLib
             {
                 await movieRepository.SetEtag(result.Item, MediaServerEtag(incoming));
 
-                if (_localFileSystem.FileExists(result.LocalPath))
+                if (_fileSystem.File.Exists(result.LocalPath))
                 {
                     Option<int> flagResult = await movieRepository.FlagNormal(library, result.Item);
                     if (flagResult.IsSome)
@@ -270,7 +270,7 @@ public abstract class MediaServerMovieLibraryScanner<TConnectionParameters, TLib
             existingEtag == MediaServerEtag(incoming))
         {
             // skip scanning unavailable/file not found items that are unchanged and still don't exist locally
-            if (!_localFileSystem.FileExists(localPath) && !ServerSupportsRemoteStreaming)
+            if (!_fileSystem.File.Exists(localPath) && !ServerSupportsRemoteStreaming)
             {
                 return false;
             }
@@ -279,7 +279,7 @@ public abstract class MediaServerMovieLibraryScanner<TConnectionParameters, TLib
         {
             // item is unchanged, but file does not exist
             // don't scan, but mark as unavailable
-            if (!_localFileSystem.FileExists(localPath))
+            if (!_fileSystem.File.Exists(localPath))
             {
                 if (ServerSupportsRemoteStreaming)
                 {

ErsatzTV.Scanner/Core/Metadata/MediaServerOtherVideoLibraryScanner.cs

@@ -1,10 +1,10 @@
 using System.Collections.Immutable;
+using System.IO.Abstractions;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Domain.MediaServer;
 using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Extensions;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Metadata;
 using ErsatzTV.Scanner.Core.Interfaces;
@@ -21,19 +21,19 @@ public abstract class MediaServerOtherVideoLibraryScanner<TConnectionParameters,
 {
     private readonly ILocalChaptersProvider _localChaptersProvider;
     private readonly IScannerProxy _scannerProxy;
-    private readonly ILocalFileSystem _localFileSystem;
+    private readonly IFileSystem _fileSystem;
     private readonly ILogger _logger;
     private readonly IMetadataRepository _metadataRepository;
 
     protected MediaServerOtherVideoLibraryScanner(
         IScannerProxy scannerProxy,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ILocalChaptersProvider localChaptersProvider,
         IMetadataRepository metadataRepository,
         ILogger logger)
     {
         _scannerProxy = scannerProxy;
-        _localFileSystem = localFileSystem;
+        _fileSystem = fileSystem;
         _localChaptersProvider = localChaptersProvider;
         _metadataRepository = metadataRepository;
         _logger = logger;
@@ -174,7 +174,7 @@ public abstract class MediaServerOtherVideoLibraryScanner<TConnectionParameters,
             {
                 await otherVideoRepository.SetEtag(result.Item, MediaServerEtag(incoming));
 
-                if (_localFileSystem.FileExists(result.LocalPath))
+                if (_fileSystem.File.Exists(result.LocalPath))
                 {
                     Option<int> flagResult = await otherVideoRepository.FlagNormal(library, result.Item);
                     if (flagResult.IsSome)
@@ -277,7 +277,7 @@ public abstract class MediaServerOtherVideoLibraryScanner<TConnectionParameters,
             existingEtag == MediaServerEtag(incoming))
         {
             // skip scanning unavailable/file not found items that are unchanged and still don't exist locally
-            if (!_localFileSystem.FileExists(localPath) && !ServerSupportsRemoteStreaming)
+            if (!_fileSystem.File.Exists(localPath) && !ServerSupportsRemoteStreaming)
             {
                 return false;
             }
@@ -286,7 +286,7 @@ public abstract class MediaServerOtherVideoLibraryScanner<TConnectionParameters,
         {
             // item is unchanged, but file does not exist
             // don't scan, but mark as unavailable
-            if (!_localFileSystem.FileExists(localPath))
+            if (!_fileSystem.File.Exists(localPath))
             {
                 if (ServerSupportsRemoteStreaming)
                 {

ErsatzTV.Scanner/Core/Metadata/MediaServerTelevisionLibraryScanner.cs

@@ -1,9 +1,9 @@
-using ErsatzTV.Core;
+using System.IO.Abstractions;
+using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Domain.MediaServer;
 using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Extensions;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Metadata;
 using ErsatzTV.Scanner.Core.Interfaces;
@@ -23,19 +23,19 @@ public abstract class MediaServerTelevisionLibraryScanner<TConnectionParameters,
 {
     private readonly ILocalChaptersProvider _localChaptersProvider;
     private readonly IScannerProxy _scannerProxy;
-    private readonly ILocalFileSystem _localFileSystem;
+    private readonly IFileSystem _fileSystem;
     private readonly ILogger _logger;
     private readonly IMetadataRepository _metadataRepository;
 
     protected MediaServerTelevisionLibraryScanner(
         IScannerProxy scannerProxy,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ILocalChaptersProvider localChaptersProvider,
         IMetadataRepository metadataRepository,
         ILogger logger)
     {
         _scannerProxy = scannerProxy;
-        _localFileSystem = localFileSystem;
+        _fileSystem = fileSystem;
         _localChaptersProvider = localChaptersProvider;
         _metadataRepository = metadataRepository;
         _logger = logger;
@@ -469,7 +469,7 @@ public abstract class MediaServerTelevisionLibraryScanner<TConnectionParameters,
             {
                 await televisionRepository.SetEtag(result.Item, MediaServerEtag(incoming), cancellationToken);
 
-                if (_localFileSystem.FileExists(result.LocalPath))
+                if (_fileSystem.File.Exists(result.LocalPath))
                 {
                     Option<int> flagResult = await televisionRepository.FlagNormal(library, result.Item, cancellationToken);
                     if (flagResult.IsSome)
@@ -541,7 +541,7 @@ public abstract class MediaServerTelevisionLibraryScanner<TConnectionParameters,
             existingEtag == MediaServerEtag(incoming))
         {
             // skip scanning unavailable/file not found items that are unchanged and still don't exist locally
-            if (!_localFileSystem.FileExists(localPath) && !ServerSupportsRemoteStreaming)
+            if (!_fileSystem.File.Exists(localPath) && !ServerSupportsRemoteStreaming)
             {
                 return false;
             }
@@ -550,7 +550,7 @@ public abstract class MediaServerTelevisionLibraryScanner<TConnectionParameters,
         {
             // item is unchanged, but file does not exist
             // don't scan, but mark as unavailable
-            if (!_localFileSystem.FileExists(localPath))
+            if (!_fileSystem.File.Exists(localPath))
             {
                 if (ServerSupportsRemoteStreaming)
                 {
@@ -741,7 +741,7 @@ public abstract class MediaServerTelevisionLibraryScanner<TConnectionParameters,
         if (deepScan || result.IsAdded || MediaServerEtag(existing) != MediaServerEtag(incoming) ||
             existing.MediaVersions.Head().Streams.Count == 0)
         {
-            // if (maybeMediaVersion.IsNone && _localFileSystem.FileExists(result.LocalPath))
+            // if (maybeMediaVersion.IsNone && _fileSystem.File.Exists(result.LocalPath))
             // {
             //     _logger.LogDebug("Refreshing {Attribute} for {Path}", "Statistics", result.LocalPath);
             //     Either<BaseError, bool> refreshResult =

ErsatzTV.Scanner/Core/Metadata/MovieFolderScanner.cs

@@ -1,4 +1,5 @@
 using System.Collections.Immutable;
+using System.IO.Abstractions;
 using Bugsnag;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
@@ -23,6 +24,7 @@ public class MovieFolderScanner : LocalFolderScanner, IMovieFolderScanner
     private readonly ILibraryRepository _libraryRepository;
     private readonly ILocalChaptersProvider _localChaptersProvider;
     private readonly IScannerProxy _scannerProxy;
+    private readonly IFileSystem _fileSystem;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILocalMetadataProvider _localMetadataProvider;
     private readonly ILocalSubtitlesProvider _localSubtitlesProvider;
@@ -32,6 +34,7 @@ public class MovieFolderScanner : LocalFolderScanner, IMovieFolderScanner
 
     public MovieFolderScanner(
         IScannerProxy scannerProxy,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         IMovieRepository movieRepository,
         ILocalStatisticsProvider localStatisticsProvider,
@@ -47,7 +50,7 @@ public class MovieFolderScanner : LocalFolderScanner, IMovieFolderScanner
         IClient client,
         ILogger<MovieFolderScanner> logger)
         : base(
-            localFileSystem,
+            fileSystem,
             localStatisticsProvider,
             metadataRepository,
             mediaItemRepository,
@@ -58,6 +61,7 @@ public class MovieFolderScanner : LocalFolderScanner, IMovieFolderScanner
             logger)
     {
         _scannerProxy = scannerProxy;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _movieRepository = movieRepository;
         _localSubtitlesProvider = localSubtitlesProvider;
@@ -209,7 +213,7 @@ public class MovieFolderScanner : LocalFolderScanner, IMovieFolderScanner
 
             foreach (string path in await _movieRepository.FindMoviePaths(libraryPath))
             {
-                if (!_localFileSystem.FileExists(path))
+                if (!_fileSystem.File.Exists(path))
                 {
                     _logger.LogInformation("Flagging missing movie at {Path}", path);
                     List<int> ids = await FlagFileNotFound(libraryPath, path);
@@ -362,7 +366,7 @@ public class MovieFolderScanner : LocalFolderScanner, IMovieFolderScanner
         string movieAsNfo = Path.ChangeExtension(path, "nfo");
         string movieNfo = Path.Combine(Path.GetDirectoryName(path) ?? string.Empty, "movie.nfo");
         return Seq.create(movieAsNfo, movieNfo)
-            .Filter(s => _localFileSystem.FileExists(s))
+            .Filter(s => _fileSystem.File.Exists(s))
             .HeadOrNone();
     }
 
@@ -380,12 +384,12 @@ public class MovieFolderScanner : LocalFolderScanner, IMovieFolderScanner
         IEnumerable<string> possibleMoviePosters = ImageFileExtensions.Collect(ext =>
                 new[] { $"{segment}.{ext}", Path.GetFileNameWithoutExtension(path) + $"-{segment}.{ext}" })
             .Map(f => Path.Combine(folder, f));
-        Option<string> result = possibleMoviePosters.Filter(p => _localFileSystem.FileExists(p)).HeadOrNone();
+        Option<string> result = possibleMoviePosters.Filter(p => _fileSystem.File.Exists(p)).HeadOrNone();
         if (result.IsNone && artworkKind == ArtworkKind.Poster)
         {
             IEnumerable<string> possibleFolderPosters = ImageFileExtensions.Collect(ext => new[] { $"folder.{ext}" })
                 .Map(f => Path.Combine(folder, f));
-            result = possibleFolderPosters.Filter(p => _localFileSystem.FileExists(p)).HeadOrNone();
+            result = possibleFolderPosters.Filter(p => _fileSystem.File.Exists(p)).HeadOrNone();
         }
 
         return result;

ErsatzTV.Scanner/Core/Metadata/MusicVideoFolderScanner.cs

@@ -1,4 +1,5 @@
 using System.Collections.Immutable;
+using System.IO.Abstractions;
 using Bugsnag;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
@@ -23,6 +24,7 @@ public class MusicVideoFolderScanner : LocalFolderScanner, IMusicVideoFolderScan
     private readonly ILibraryRepository _libraryRepository;
     private readonly ILocalChaptersProvider _localChaptersProvider;
     private readonly IScannerProxy _scannerProxy;
+    private readonly IFileSystem _fileSystem;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILocalMetadataProvider _localMetadataProvider;
     private readonly ILocalSubtitlesProvider _localSubtitlesProvider;
@@ -32,6 +34,7 @@ public class MusicVideoFolderScanner : LocalFolderScanner, IMusicVideoFolderScan
 
     public MusicVideoFolderScanner(
         IScannerProxy scannerProxy,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         ILocalStatisticsProvider localStatisticsProvider,
         ILocalMetadataProvider localMetadataProvider,
@@ -47,7 +50,7 @@ public class MusicVideoFolderScanner : LocalFolderScanner, IMusicVideoFolderScan
         ITempFilePool tempFilePool,
         IClient client,
         ILogger<MusicVideoFolderScanner> logger) : base(
-        localFileSystem,
+        fileSystem,
         localStatisticsProvider,
         metadataRepository,
         mediaItemRepository,
@@ -58,6 +61,7 @@ public class MusicVideoFolderScanner : LocalFolderScanner, IMusicVideoFolderScan
         logger)
     {
         _scannerProxy = scannerProxy;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _localMetadataProvider = localMetadataProvider;
         _localSubtitlesProvider = localSubtitlesProvider;
@@ -173,7 +177,7 @@ public class MusicVideoFolderScanner : LocalFolderScanner, IMusicVideoFolderScan
 
             foreach (string path in await _musicVideoRepository.FindMusicVideoPaths(libraryPath))
             {
-                if (!_localFileSystem.FileExists(path))
+                if (!_fileSystem.File.Exists(path))
                 {
                     _logger.LogInformation("Flagging missing music video at {Path}", path);
                     List<int> musicVideoIds = await FlagFileNotFound(libraryPath, path);
@@ -459,7 +463,7 @@ public class MusicVideoFolderScanner : LocalFolderScanner, IMusicVideoFolderScan
     }
 
     private Option<string> LocateNfoFileForArtist(string artistFolder) =>
-        Optional(Path.Combine(artistFolder, "artist.nfo")).Filter(s => _localFileSystem.FileExists(s));
+        Optional(Path.Combine(artistFolder, "artist.nfo")).Filter(s => _fileSystem.File.Exists(s));
 
     private Option<string> LocateArtworkForArtist(string artistFolder, ArtworkKind artworkKind)
     {
@@ -473,7 +477,7 @@ public class MusicVideoFolderScanner : LocalFolderScanner, IMusicVideoFolderScan
         return ImageFileExtensions
             .Map(ext => $"{segment}.{ext}")
             .Map(f => Path.Combine(artistFolder, f))
-            .Filter(s => _localFileSystem.FileExists(s))
+            .Filter(s => _fileSystem.File.Exists(s))
             .HeadOrNone();
     }
 
@@ -481,7 +485,7 @@ public class MusicVideoFolderScanner : LocalFolderScanner, IMusicVideoFolderScan
     {
         string path = musicVideo.MediaVersions.Head().MediaFiles.Head().Path;
         return Optional(Path.ChangeExtension(path, "nfo"))
-            .Filter(s => _localFileSystem.FileExists(s))
+            .Filter(s => _fileSystem.File.Exists(s))
             .HeadOrNone();
     }
 
@@ -554,7 +558,7 @@ public class MusicVideoFolderScanner : LocalFolderScanner, IMusicVideoFolderScan
 
         return ImageFileExtensions
             .SelectMany(ext => new[] { Path.ChangeExtension(path, ext), Path.ChangeExtension(thumbPath, ext) })
-            .Filter(f => _localFileSystem.FileExists(f))
+            .Filter(f => _fileSystem.File.Exists(f))
             .HeadOrNone();
     }
 }

ErsatzTV.Scanner/Core/Metadata/OtherVideoFolderScanner.cs

@@ -1,4 +1,5 @@
 using System.Collections.Immutable;
+using System.IO.Abstractions;
 using Bugsnag;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
@@ -22,6 +23,7 @@ public class OtherVideoFolderScanner : LocalFolderScanner, IOtherVideoFolderScan
     private readonly ILibraryRepository _libraryRepository;
     private readonly ILocalChaptersProvider _localChaptersProvider;
     private readonly IScannerProxy _scannerProxy;
+    private readonly IFileSystem _fileSystem;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILocalMetadataProvider _localMetadataProvider;
     private readonly ILocalSubtitlesProvider _localSubtitlesProvider;
@@ -31,6 +33,7 @@ public class OtherVideoFolderScanner : LocalFolderScanner, IOtherVideoFolderScan
 
     public OtherVideoFolderScanner(
         IScannerProxy scannerProxy,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         ILocalStatisticsProvider localStatisticsProvider,
         ILocalMetadataProvider localMetadataProvider,
@@ -45,7 +48,7 @@ public class OtherVideoFolderScanner : LocalFolderScanner, IOtherVideoFolderScan
         ITempFilePool tempFilePool,
         IClient client,
         ILogger<OtherVideoFolderScanner> logger) : base(
-        localFileSystem,
+        fileSystem,
         localStatisticsProvider,
         metadataRepository,
         mediaItemRepository,
@@ -56,6 +59,7 @@ public class OtherVideoFolderScanner : LocalFolderScanner, IOtherVideoFolderScan
         logger)
     {
         _scannerProxy = scannerProxy;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _localMetadataProvider = localMetadataProvider;
         _localSubtitlesProvider = localSubtitlesProvider;
@@ -220,7 +224,7 @@ public class OtherVideoFolderScanner : LocalFolderScanner, IOtherVideoFolderScan
 
             foreach (string path in await _otherVideoRepository.FindOtherVideoPaths(libraryPath))
             {
-                if (!_localFileSystem.FileExists(path))
+                if (!_fileSystem.File.Exists(path))
                 {
                     _logger.LogInformation("Flagging missing other video at {Path}", path);
                     List<int> otherVideoIds = await FlagFileNotFound(libraryPath, path);
@@ -274,7 +278,7 @@ public class OtherVideoFolderScanner : LocalFolderScanner, IOtherVideoFolderScan
             string path = otherVideo.MediaVersions.Head().MediaFiles.Head().Path;
 
             Option<string> maybeNfoFile = new List<string> { Path.ChangeExtension(path, "nfo") }
-                .Filter(_localFileSystem.FileExists)
+                .Filter(_fileSystem.File.Exists)
                 .HeadOrNone();
 
             if (maybeNfoFile.IsNone)
@@ -376,7 +380,7 @@ public class OtherVideoFolderScanner : LocalFolderScanner, IOtherVideoFolderScan
         string path = otherVideo.MediaVersions.Head().MediaFiles.Head().Path;
         return ImageFileExtensions
             .Map(ext => Path.ChangeExtension(path, ext))
-            .Filter(f => _localFileSystem.FileExists(f))
+            .Filter(f => _fileSystem.File.Exists(f))
             .HeadOrNone();
     }
 }

ErsatzTV.Scanner/Core/Metadata/RemoteStreamFolderScanner.cs

@@ -1,4 +1,5 @@
 using System.Collections.Immutable;
+using System.IO.Abstractions;
 using Bugsnag;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
@@ -24,6 +25,7 @@ public class RemoteStreamFolderScanner : LocalFolderScanner, IRemoteStreamFolder
     private readonly IClient _client;
     private readonly ILibraryRepository _libraryRepository;
     private readonly IScannerProxy _scannerProxy;
+    private readonly IFileSystem _fileSystem;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILocalMetadataProvider _localMetadataProvider;
     private readonly ILogger<RemoteStreamFolderScanner> _logger;
@@ -32,6 +34,7 @@ public class RemoteStreamFolderScanner : LocalFolderScanner, IRemoteStreamFolder
 
     public RemoteStreamFolderScanner(
         IScannerProxy scannerProxy,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         ILocalStatisticsProvider localStatisticsProvider,
         ILocalMetadataProvider localMetadataProvider,
@@ -44,7 +47,7 @@ public class RemoteStreamFolderScanner : LocalFolderScanner, IRemoteStreamFolder
         ITempFilePool tempFilePool,
         IClient client,
         ILogger<RemoteStreamFolderScanner> logger) : base(
-        localFileSystem,
+        fileSystem,
         localStatisticsProvider,
         metadataRepository,
         mediaItemRepository,
@@ -55,6 +58,7 @@ public class RemoteStreamFolderScanner : LocalFolderScanner, IRemoteStreamFolder
         logger)
     {
         _scannerProxy = scannerProxy;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _localMetadataProvider = localMetadataProvider;
         _remoteStreamRepository = remoteStreamRepository;
@@ -213,7 +217,7 @@ public class RemoteStreamFolderScanner : LocalFolderScanner, IRemoteStreamFolder
 
             foreach (string path in await _remoteStreamRepository.FindRemoteStreamPaths(libraryPath, cancellationToken))
             {
-                if (!_localFileSystem.FileExists(path))
+                if (!_fileSystem.File.Exists(path))
                 {
                     _logger.LogInformation("Flagging missing remote stream at {Path}", path);
                     List<int> remoteStreamIds = await FlagFileNotFound(libraryPath, path);

ErsatzTV.Scanner/Core/Metadata/SongFolderScanner.cs

@@ -1,4 +1,5 @@
 using System.Collections.Immutable;
+using System.IO.Abstractions;
 using Bugsnag;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
@@ -21,6 +22,7 @@ public class SongFolderScanner : LocalFolderScanner, ISongFolderScanner
     private readonly IClient _client;
     private readonly ILibraryRepository _libraryRepository;
     private readonly IScannerProxy _scannerProxy;
+    private readonly IFileSystem _fileSystem;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILocalMetadataProvider _localMetadataProvider;
     private readonly ILogger<SongFolderScanner> _logger;
@@ -29,6 +31,7 @@ public class SongFolderScanner : LocalFolderScanner, ISongFolderScanner
 
     public SongFolderScanner(
         IScannerProxy scannerProxy,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         ILocalStatisticsProvider localStatisticsProvider,
         ILocalMetadataProvider localMetadataProvider,
@@ -41,7 +44,7 @@ public class SongFolderScanner : LocalFolderScanner, ISongFolderScanner
         ITempFilePool tempFilePool,
         IClient client,
         ILogger<SongFolderScanner> logger) : base(
-        localFileSystem,
+        fileSystem,
         localStatisticsProvider,
         metadataRepository,
         mediaItemRepository,
@@ -52,6 +55,7 @@ public class SongFolderScanner : LocalFolderScanner, ISongFolderScanner
         logger)
     {
         _scannerProxy = scannerProxy;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _localMetadataProvider = localMetadataProvider;
         _songRepository = songRepository;
@@ -201,7 +205,7 @@ public class SongFolderScanner : LocalFolderScanner, ISongFolderScanner
 
             foreach (string path in await _songRepository.FindSongPaths(libraryPath))
             {
-                if (!_localFileSystem.FileExists(path))
+                if (!_fileSystem.File.Exists(path))
                 {
                     _logger.LogInformation("Flagging missing song at {Path}", path);
                     List<int> songIds = await FlagFileNotFound(libraryPath, path);
@@ -336,7 +340,7 @@ public class SongFolderScanner : LocalFolderScanner, ISongFolderScanner
             string coverPath = Path.Combine(di.FullName, "cover.jpg");
             return ImageFileExtensions
                 .Map(ext => Path.ChangeExtension(coverPath, ext))
-                .Filter(f => _localFileSystem.FileExists(f))
+                .Filter(f => _fileSystem.File.Exists(f))
                 .HeadOrNone();
         }).Flatten();
     }

ErsatzTV.Scanner/Core/Metadata/TelevisionFolderScanner.cs

@@ -1,4 +1,5 @@
 using System.Collections.Immutable;
+using System.IO.Abstractions;
 using Bugsnag;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
@@ -23,6 +24,7 @@ public class TelevisionFolderScanner : LocalFolderScanner, ITelevisionFolderScan
     private readonly ILibraryRepository _libraryRepository;
     private readonly ILocalChaptersProvider _localChaptersProvider;
     private readonly IScannerProxy _scannerProxy;
+    private readonly IFileSystem _fileSystem;
     private readonly ILocalFileSystem _localFileSystem;
     private readonly ILocalMetadataProvider _localMetadataProvider;
     private readonly ILocalSubtitlesProvider _localSubtitlesProvider;
@@ -33,6 +35,7 @@ public class TelevisionFolderScanner : LocalFolderScanner, ITelevisionFolderScan
 
     public TelevisionFolderScanner(
         IScannerProxy scannerProxy,
+        IFileSystem fileSystem,
         ILocalFileSystem localFileSystem,
         ITelevisionRepository televisionRepository,
         ILocalStatisticsProvider localStatisticsProvider,
@@ -48,7 +51,7 @@ public class TelevisionFolderScanner : LocalFolderScanner, ITelevisionFolderScan
         IClient client,
         IFallbackMetadataProvider fallbackMetadataProvider,
         ILogger<TelevisionFolderScanner> logger) : base(
-        localFileSystem,
+        fileSystem,
         localStatisticsProvider,
         metadataRepository,
         mediaItemRepository,
@@ -59,6 +62,7 @@ public class TelevisionFolderScanner : LocalFolderScanner, ITelevisionFolderScan
         logger)
     {
         _scannerProxy = scannerProxy;
+        _fileSystem = fileSystem;
         _localFileSystem = localFileSystem;
         _televisionRepository = televisionRepository;
         _localMetadataProvider = localMetadataProvider;
@@ -169,7 +173,7 @@ public class TelevisionFolderScanner : LocalFolderScanner, ITelevisionFolderScan
 
             foreach (string path in await _televisionRepository.FindEpisodePaths(libraryPath))
             {
-                if (!_localFileSystem.FileExists(path))
+                if (!_fileSystem.File.Exists(path))
                 {
                     _logger.LogInformation("Flagging missing episode at {Path}", path);
 
@@ -584,12 +588,12 @@ public class TelevisionFolderScanner : LocalFolderScanner, ITelevisionFolderScan
     }
 
     private Option<string> LocateNfoFileForShow(string showFolder) =>
-        Optional(Path.Combine(showFolder, "tvshow.nfo")).Filter(s => _localFileSystem.FileExists(s));
+        Optional(Path.Combine(showFolder, "tvshow.nfo")).Filter(s => _fileSystem.File.Exists(s));
 
     private Option<string> LocateNfoFile(Episode episode)
     {
         string path = episode.MediaVersions.Head().MediaFiles.Head().Path;
-        return Optional(Path.ChangeExtension(path, "nfo")).Filter(s => _localFileSystem.FileExists(s));
+        return Optional(Path.ChangeExtension(path, "nfo")).Filter(s => _fileSystem.File.Exists(s));
     }
 
     private Option<string> LocateArtworkForShow(string showFolder, ArtworkKind artworkKind)
@@ -606,7 +610,7 @@ public class TelevisionFolderScanner : LocalFolderScanner, ITelevisionFolderScan
             .Map(ext => segments.Map(segment => $"{segment}.{ext}"))
             .Flatten()
             .Map(f => Path.Combine(showFolder, f))
-            .Filter(s => _localFileSystem.FileExists(s))
+            .Filter(s => _fileSystem.File.Exists(s))
             .HeadOrNone();
     }
 
@@ -615,7 +619,7 @@ public class TelevisionFolderScanner : LocalFolderScanner, ITelevisionFolderScan
         string folder = Path.GetDirectoryName(seasonFolder) ?? string.Empty;
         return ImageFileExtensions
             .Map(ext => Path.Combine(folder, $"season{season.SeasonNumber:00}-poster.{ext}"))
-            .Filter(s => _localFileSystem.FileExists(s))
+            .Filter(s => _fileSystem.File.Exists(s))
             .HeadOrNone();
     }
 
@@ -626,7 +630,7 @@ public class TelevisionFolderScanner : LocalFolderScanner, ITelevisionFolderScan
         return ImageFileExtensions
             .Map(ext => Path.GetFileNameWithoutExtension(path) + $"-thumb.{ext}")
             .Map(f => Path.Combine(folder, f))
-            .Filter(f => _localFileSystem.FileExists(f))
+            .Filter(f => _fileSystem.File.Exists(f))
             .HeadOrNone();
     }
 }

ErsatzTV.Scanner/Core/Plex/PlexMovieLibraryScanner.cs

@@ -1,7 +1,7 @@
-using ErsatzTV.Core;
+using System.IO.Abstractions;
+using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Extensions;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Plex;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Metadata;
@@ -33,12 +33,12 @@ public class PlexMovieLibraryScanner :
         IMediaSourceRepository mediaSourceRepository,
         IPlexMovieRepository plexMovieRepository,
         IPlexPathReplacementService plexPathReplacementService,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ILocalChaptersProvider localChaptersProvider,
         ILogger<PlexMovieLibraryScanner> logger)
         : base(
             scannerProxy,
-            localFileSystem,
+            fileSystem,
             localChaptersProvider,
             metadataRepository,
             logger)

ErsatzTV.Scanner/Core/Plex/PlexOtherVideoLibraryScanner.cs

@@ -1,7 +1,7 @@
+using System.IO.Abstractions;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Extensions;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Plex;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Metadata;
@@ -33,12 +33,12 @@ public class PlexOtherVideoLibraryScanner :
         IMediaSourceRepository mediaSourceRepository,
         IPlexOtherVideoRepository plexOtherVideoRepository,
         IPlexPathReplacementService plexPathReplacementService,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ILocalChaptersProvider localChaptersProvider,
         ILogger<PlexOtherVideoLibraryScanner> logger)
         : base(
             scannerProxy,
-            localFileSystem,
+            fileSystem,
             localChaptersProvider,
             metadataRepository,
             logger)

ErsatzTV.Scanner/Core/Plex/PlexTelevisionLibraryScanner.cs

@@ -1,9 +1,9 @@
-using System.Text.RegularExpressions;
+using System.IO.Abstractions;
+using System.Text.RegularExpressions;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Errors;
 using ErsatzTV.Core.Extensions;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Plex;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Metadata;
@@ -37,12 +37,12 @@ public partial class PlexTelevisionLibraryScanner :
         IMediaSourceRepository mediaSourceRepository,
         IPlexPathReplacementService plexPathReplacementService,
         IPlexTelevisionRepository plexTelevisionRepository,
-        ILocalFileSystem localFileSystem,
+        IFileSystem fileSystem,
         ILocalChaptersProvider localChaptersProvider,
         ILogger<PlexTelevisionLibraryScanner> logger)
         : base(
             scannerProxy,
-            localFileSystem,
+            fileSystem,
             localChaptersProvider,
             metadataRepository,
             logger)

ErsatzTV.Scanner/Program.cs

@@ -1,3 +1,4 @@
+using System.IO.Abstractions;
 using Bugsnag;
 using Bugsnag.Payload;
 using Dapper;
@@ -47,6 +48,7 @@ using Microsoft.IO;
 using Serilog;
 using Serilog.Events;
 using Serilog.Formatting.Compact;
+using Testably.Abstractions;
 using Exception = System.Exception;
 using IConfiguration = Bugsnag.IConfiguration;
 
@@ -252,6 +254,8 @@ public class Program
                 services.AddSingleton<IScannerProxy, ScannerProxy>();
                 services.AddSingleton<ILanguageCodeCache, LanguageCodeCache>();
 
+                services.AddSingleton<IFileSystem, RealFileSystem>();
+
                 services.AddMediatR(config => config.RegisterServicesFromAssemblyContaining<Worker>());
                 services.AddMemoryCache();
 

ErsatzTV/Controllers/Api/TroubleshootController.cs

@@ -1,3 +1,4 @@
+using System.IO.Abstractions;
 using System.Threading.Channels;
 using ErsatzTV.Application;
 using ErsatzTV.Application.MediaItems;
@@ -6,7 +7,6 @@ using ErsatzTV.Application.Troubleshooting.Queries;
 using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.FFmpeg;
-using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Interfaces.Troubleshooting;
 using MediatR;
@@ -18,7 +18,7 @@ namespace ErsatzTV.Controllers.Api;
 [ApiController]
 public class TroubleshootController(
     ChannelWriter<IFFmpegWorkerRequest> channelWriter,
-    ILocalFileSystem localFileSystem,
+    IFileSystem fileSystem,
     IConfigElementRepository configElementRepository,
     ITroubleshootingNotifier notifier,
     IMediator mediator) : ControllerBase
@@ -104,7 +104,7 @@ public class TroubleshootController(
                         cancellationToken);
 
                     string playlistFile = Path.Combine(FileSystemLayout.TranscodeTroubleshootingFolder, "live.m3u8");
-                    while (!localFileSystem.FileExists(playlistFile))
+                    while (!fileSystem.File.Exists(playlistFile))
                     {
                         await Task.Delay(TimeSpan.FromMilliseconds(100), cancellationToken);
                         if (cancellationToken.IsCancellationRequested || notifier.IsFailed(sessionId))

ErsatzTV/Pages/Troubleshooting/PlaybackTroubleshooting.razor

@@ -1,5 +1,6 @@
 @page "/system/troubleshooting/playback"
 @using System.Globalization
+@using System.IO.Abstractions
 @using ErsatzTV.Application.Channels
 @using ErsatzTV.Application.FFmpegProfiles
 @using ErsatzTV.Application.Graphics
@@ -7,7 +8,6 @@
 @using ErsatzTV.Application.Troubleshooting
 @using ErsatzTV.Application.Troubleshooting.Queries
 @using ErsatzTV.Application.Watermarks
-@using ErsatzTV.Core.Interfaces.Metadata
 @using ErsatzTV.Core.Notifications
 @using MediatR.Courier
 @using Microsoft.AspNetCore.WebUtilities
@@ -18,7 +18,7 @@
 @inject IEntityLocker Locker
 @inject ICourier Courier;
 @inject ISnackbar Snackbar;
-@inject ILocalFileSystem LocalFileSystem;
+@inject IFileSystem FileSystem;
 
 <MudForm Style="max-height: 100%">
     <MudPaper Square="true" Style="display: flex; height: 64px; min-height: 64px; width: 100%; z-index: 100; align-items: center">
@@ -422,7 +422,7 @@
         }
 
         string logFileName = Path.Combine(FileSystemLayout.TranscodeTroubleshootingFolder, "logs.txt");
-        if (LocalFileSystem.FileExists(logFileName))
+        if (FileSystem.File.Exists(logFileName))
         {
             string text = await File.ReadAllTextAsync(logFileName);
             await InvokeAsync(async () => { await _logsField.SetText(text); });

ErsatzTV/Services/RunOnce/CacheCleanerService.cs

@@ -1,4 +1,5 @@
-using ErsatzTV.Core;
+using System.IO.Abstractions;
+using ErsatzTV.Core;
 using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Metadata;
 using ErsatzTV.Infrastructure.Data;
@@ -6,39 +7,30 @@ using Microsoft.EntityFrameworkCore;
 
 namespace ErsatzTV.Services.RunOnce;
 
-public class CacheCleanerService : BackgroundService
+public class CacheCleanerService(
+    IServiceScopeFactory serviceScopeFactory,
+    SystemStartup systemStartup,
+    ILogger<CacheCleanerService> logger)
+    : BackgroundService
 {
-    private readonly ILogger<CacheCleanerService> _logger;
-    private readonly IServiceScopeFactory _serviceScopeFactory;
-    private readonly SystemStartup _systemStartup;
-
-    public CacheCleanerService(
-        IServiceScopeFactory serviceScopeFactory,
-        SystemStartup systemStartup,
-        ILogger<CacheCleanerService> logger)
-    {
-        _serviceScopeFactory = serviceScopeFactory;
-        _systemStartup = systemStartup;
-        _logger = logger;
-    }
-
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
     {
         await Task.Yield();
 
-        await _systemStartup.WaitForDatabase(stoppingToken);
+        await systemStartup.WaitForDatabase(stoppingToken);
         if (stoppingToken.IsCancellationRequested)
         {
             return;
         }
 
-        using IServiceScope scope = _serviceScopeFactory.CreateScope();
+        using IServiceScope scope = serviceScopeFactory.CreateScope();
         await using TvContext dbContext = scope.ServiceProvider.GetRequiredService<TvContext>();
         ILocalFileSystem localFileSystem = scope.ServiceProvider.GetRequiredService<ILocalFileSystem>();
+        IFileSystem fileSystem = scope.ServiceProvider.GetRequiredService<IFileSystem>();
 
-        if (localFileSystem.FolderExists(FileSystemLayout.LegacyImageCacheFolder))
+        if (fileSystem.Directory.Exists(FileSystemLayout.LegacyImageCacheFolder))
         {
-            _logger.LogInformation("Migrating channel logos from legacy image cache folder");
+            logger.LogInformation("Migrating channel logos from legacy image cache folder");
 
             List<string> logos = await dbContext.Channels
                 .AsNoTracking()
@@ -50,7 +42,7 @@ public class CacheCleanerService : BackgroundService
             foreach (string logo in logos)
             {
                 string legacyPath = Path.Combine(FileSystemLayout.LegacyImageCacheFolder, logo);
-                if (localFileSystem.FileExists(legacyPath))
+                if (fileSystem.File.Exists(legacyPath))
                 {
                     string subfolder = logo[..2];
                     string newPath = Path.Combine(FileSystemLayout.LogoCacheFolder, subfolder, logo);
@@ -58,20 +50,20 @@ public class CacheCleanerService : BackgroundService
                 }
             }
 
-            _logger.LogInformation("Deleting legacy image cache folder");
+            logger.LogInformation("Deleting legacy image cache folder");
             Directory.Delete(FileSystemLayout.LegacyImageCacheFolder, true);
         }
 
-        if (localFileSystem.FolderExists(FileSystemLayout.TranscodeFolder))
+        if (fileSystem.Directory.Exists(FileSystemLayout.TranscodeFolder))
         {
-            _logger.LogInformation("Emptying transcode cache folder");
+            logger.LogInformation("Emptying transcode cache folder");
             localFileSystem.EmptyFolder(FileSystemLayout.TranscodeFolder);
-            _logger.LogInformation("Done emptying transcode cache folder");
+            logger.LogInformation("Done emptying transcode cache folder");
         }
 
-        if (localFileSystem.FolderExists(FileSystemLayout.ChannelGuideCacheFolder))
+        if (fileSystem.Directory.Exists(FileSystemLayout.ChannelGuideCacheFolder))
         {
-            _logger.LogInformation("Cleaning channel cache");
+            logger.LogInformation("Cleaning channel cache");
 
             List<string> channelFiles = await dbContext.Channels
                 .AsNoTracking()

ErsatzTV/Startup.cs

@@ -1,5 +1,6 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
+using System.IO.Abstractions;
 using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Text;
@@ -99,6 +100,7 @@ using Refit;
 using Scalar.AspNetCore;
 using Serilog;
 using Serilog.Events;
+using Testably.Abstractions;
 
 namespace ErsatzTV;
 
@@ -692,6 +694,8 @@ public class Startup
     {
         services.AddSingleton<IEnvironmentValidator, EnvironmentValidator>();
 
+        services.AddSingleton<IFileSystem, RealFileSystem>();
+
         services.AddSingleton<IDatabaseMigrations, DatabaseMigrations>();
         services.AddSingleton<IPlexSecretStore, PlexSecretStore>();
         services.AddSingleton<IPlexTvApiClient, PlexTvApiClient>(); // TODO: does this need to be singleton?