Add TestsAssemblyTempPath to enable the ability to redirect to a central location

.gitignore

@@ -20,3 +20,4 @@ ILSpy.Installer/wix/
 /VERSION
 /ICSharpCode.Decompiler/Properties/DecompilerVersionInfo.cs
 */.vscode/
+DecompilerTests.config.json

Directory.Packages.props

@@ -21,6 +21,8 @@
     <PackageVersion Include="Microsoft.DiaSymReader.Converter.Xml" Version="1.1.0-beta2-22171-02" />
     <PackageVersion Include="Microsoft.DiaSymReader" Version="1.4.0" />
     <PackageVersion Include="Microsoft.DiaSymReader.Native" Version="17.0.0-beta1.21524.1" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration" Version="8.0.0" />
+    <PackageVersion Include="Microsoft.Extensions.Configuration.Json" Version="8.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="8.0.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
     <PackageVersion Include="Microsoft.NETCore.ILAsm" Version="8.0.0" />

ICSharpCode.Decompiler.Tests/Helpers/TestsAssemblyOutput.cs

@@ -17,24 +17,56 @@
 // DEALINGS IN THE SOFTWARE.
 
 
+using System;
 using System.IO;
 
+using Microsoft.Extensions.Configuration;
+
 namespace ICSharpCode.Decompiler.Tests.Helpers
 {
 	/// <summary>
 	/// Centralizes all file-path generation for compilation output (assemblies)
-	/// Here a redirect can be added to a different location for the output (ie a directory that is excluded from virus scanning)
+	/// 
+	/// DecompilerTests.config.json file format:
+	/// {
+	/// 	"TestsAssemblyTempPath": "d:\\test\\"
+	/// }
 	/// </summary>
 	internal static class TestsAssemblyOutput
 	{
+		static string? TestsAssemblyTempPath = null;
+
+		private static bool UseCustomPath => !string.IsNullOrWhiteSpace(TestsAssemblyTempPath);
+
+		static TestsAssemblyOutput()
+		{
+			var builder = new ConfigurationBuilder()
+				.AddJsonFile("DecompilerTests.config.json", optional: true, reloadOnChange: false);
+
+			IConfigurationRoot configuration = builder.Build();
+			var pathRedirectIfAny = configuration["TestsAssemblyTempPath"];
+
+			if (!string.IsNullOrWhiteSpace(pathRedirectIfAny))
+			{
+				TestsAssemblyTempPath = pathRedirectIfAny;
+			}
+		}
+
 		public static string GetFilePath(string testCasePath, string testName, string computedExtension)
 		{
-			return Path.Combine(testCasePath, testName) + computedExtension;
+			if (!UseCustomPath)
+				return Path.Combine(testCasePath, testName) + computedExtension;
+
+			// As we are using the TestsAssemblyTempPath flat, we need to make sure that duplicated test names don't create file name clashes
+			return Path.Combine(TestsAssemblyTempPath, testName) + Guid.NewGuid().ToString() + computedExtension;
 		}
 
 		public static string GetTempFileName()
 		{
-			return Path.GetTempFileName();
+			if (!UseCustomPath)
+				return Path.GetTempFileName();
+
+			return Path.Combine(TestsAssemblyTempPath, Path.GetRandomFileName());
 		}
 	}
 }

ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj

@@ -50,6 +50,8 @@
   <ItemGroup>
     <PackageReference Include="DiffLib" />
     <PackageReference Include="CliWrap" />
+    <PackageReference Include="Microsoft.Extensions.Configuration" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" />
     <PackageReference Include="NuGet.Protocol" />
     <PackageReference Include="System.Collections.Immutable" />
     <PackageReference Include="System.Reflection.Metadata" />