diff --git a/ErsatzTV.Core.Tests/Scheduling/SequentialScheduleSelectorTests.cs b/ErsatzTV.Core.Tests/Scheduling/SequentialScheduleSelectorTests.cs
new file mode 100644
index 000000000..e1eba0a41
--- /dev/null
+++ b/ErsatzTV.Core.Tests/Scheduling/SequentialScheduleSelectorTests.cs
@@ -0,0 +1,168 @@
+using ErsatzTV.Core.Scheduling.YamlScheduling;
+using ErsatzTV.Core.Scheduling.YamlScheduling.Models;
+using NUnit.Framework;
+using Shouldly;
+
+namespace ErsatzTV.Core.Tests.Scheduling;
+
+public static class SequentialScheduleSelectorTests
+{
+    [TestFixture]
+    public class GetActiveSchedule
+    {
+        private static readonly TimeSpan Offset = TimeSpan.FromHours(-5);
+
+        [Test]
+        public void Should_Return_None_When_No_Schedules()
+        {
+            Option<YamlPlayoutScheduleItem> result = SequentialScheduleSelector.GetActiveSchedule(
+                new List<YamlPlayoutScheduleItem>(),
+                new DateTimeOffset(2025, 4, 15, 12, 0, 0, Offset));
+
+            result.IsNone.ShouldBeTrue();
+        }
+
+        [Test]
+        public void Should_Match_Annual_Range_Every_Year()
+        {
+            var april = new YamlPlayoutScheduleItem
+            {
+                Name = "April",
+                StartDate = "04-01",
+                EndDate = "04-30"
+            };
+
+            SequentialScheduleSelector
+                .GetActiveSchedule([april], new DateTimeOffset(2025, 4, 15, 12, 0, 0, Offset))
+                .IfNone(() => null).ShouldBe(april);
+
+            SequentialScheduleSelector
+                .GetActiveSchedule([april], new DateTimeOffset(2030, 4, 1, 0, 0, 0, Offset))
+                .IfNone(() => null).ShouldBe(april);
+        }
+
+        [Test]
+        public void Should_Not_Match_Annual_Range_Outside_Dates()
+        {
+            var april = new YamlPlayoutScheduleItem
+            {
+                Name = "April",
+                StartDate = "04-01",
+                EndDate = "04-30"
+            };
+
+            SequentialScheduleSelector
+                .GetActiveSchedule([april], new DateTimeOffset(2025, 5, 1, 0, 0, 0, Offset))
+                .IsNone.ShouldBeTrue();
+        }
+
+        [Test]
+        public void Should_Match_Specific_Year_Only()
+        {
+            var christmas = new YamlPlayoutScheduleItem
+            {
+                Name = "Christmas 2025",
+                StartDate = "2025-12-25",
+                EndDate = "2025-12-25"
+            };
+
+            SequentialScheduleSelector
+                .GetActiveSchedule([christmas], new DateTimeOffset(2025, 12, 25, 8, 0, 0, Offset))
+                .IfNone(() => null).ShouldBe(christmas);
+
+            SequentialScheduleSelector
+                .GetActiveSchedule([christmas], new DateTimeOffset(2026, 12, 25, 8, 0, 0, Offset))
+                .IsNone.ShouldBeTrue();
+        }
+
+        [Test]
+        public void Should_Match_Annual_Range_That_Wraps_Year_Boundary()
+        {
+            var winter = new YamlPlayoutScheduleItem
+            {
+                Name = "Winter",
+                StartDate = "12-01",
+                EndDate = "01-15"
+            };
+
+            SequentialScheduleSelector
+                .GetActiveSchedule([winter], new DateTimeOffset(2025, 12, 20, 0, 0, 0, Offset))
+                .IfNone(() => null).ShouldBe(winter);
+
+            SequentialScheduleSelector
+                .GetActiveSchedule([winter], new DateTimeOffset(2026, 1, 10, 0, 0, 0, Offset))
+                .IfNone(() => null).ShouldBe(winter);
+
+            SequentialScheduleSelector
+                .GetActiveSchedule([winter], new DateTimeOffset(2026, 6, 1, 0, 0, 0, Offset))
+                .IsNone.ShouldBeTrue();
+        }
+
+        [Test]
+        public void Should_Prefer_Higher_Priority_On_Overlap()
+        {
+            var december = new YamlPlayoutScheduleItem
+            {
+                Name = "December",
+                StartDate = "12-01",
+                EndDate = "12-31",
+                Priority = 0
+            };
+
+            var christmasDay = new YamlPlayoutScheduleItem
+            {
+                Name = "Christmas Day",
+                StartDate = "12-25",
+                EndDate = "12-25",
+                Priority = 10
+            };
+
+            SequentialScheduleSelector
+                .GetActiveSchedule([december, christmasDay], new DateTimeOffset(2025, 12, 25, 12, 0, 0, Offset))
+                .IfNone(() => null).ShouldBe(christmasDay);
+
+            SequentialScheduleSelector
+                .GetActiveSchedule([december, christmasDay], new DateTimeOffset(2025, 12, 20, 12, 0, 0, Offset))
+                .IfNone(() => null).ShouldBe(december);
+        }
+
+        [Test]
+        public void Should_Break_Priority_Ties_By_Definition_Order()
+        {
+            var first = new YamlPlayoutScheduleItem
+            {
+                Name = "First",
+                StartDate = "04-01",
+                EndDate = "04-30",
+                Priority = 5
+            };
+
+            var second = new YamlPlayoutScheduleItem
+            {
+                Name = "Second",
+                StartDate = "04-01",
+                EndDate = "04-30",
+                Priority = 5
+            };
+
+            SequentialScheduleSelector
+                .GetActiveSchedule([first, second], new DateTimeOffset(2025, 4, 15, 12, 0, 0, Offset))
+                .IfNone(() => null).ShouldBe(first);
+        }
+
+        [Test]
+        public void Should_Not_Match_Invalid_Or_Missing_Dates()
+        {
+            var invalid = new YamlPlayoutScheduleItem
+            {
+                Name = "Invalid",
+                StartDate = "not-a-date",
+                EndDate = "04-30"
+            };
+
+            SequentialScheduleSelector
+                .GetActiveSchedule([invalid], new DateTimeOffset(2025, 4, 15, 12, 0, 0, Offset))
+                .IsNone.ShouldBeTrue();
+        }
+    }
+}
diff --git a/ErsatzTV.Core.Tests/Scheduling/YamlPlayoutContextTests.cs b/ErsatzTV.Core.Tests/Scheduling/YamlPlayoutContextTests.cs
new file mode 100644
index 000000000..107fdd4e4
--- /dev/null
+++ b/ErsatzTV.Core.Tests/Scheduling/YamlPlayoutContextTests.cs
@@ -0,0 +1,77 @@
+using ErsatzTV.Core.Domain;
+using ErsatzTV.Core.Scheduling.YamlScheduling;
+using ErsatzTV.Core.Scheduling.YamlScheduling.Models;
+using NUnit.Framework;
+using Shouldly;
+
+namespace ErsatzTV.Core.Tests.Scheduling;
+
+public static class YamlPlayoutContextTests
+{
+    [TestFixture]
+    public class ScheduleSwitching
+    {
+        private static YamlPlayoutContext CreateContext()
+        {
+            var definition = new YamlPlayoutDefinition
+            {
+                Playout = [new YamlPlayoutInstruction()],
+                Schedules =
+                [
+                    new YamlPlayoutScheduleItem
+                    {
+                        Name = "Christmas",
+                        StartDate = "12-25",
+                        EndDate = "12-25",
+                        Playout = [new YamlPlayoutInstruction()]
+                    }
+                ]
+            };
+
+            return new YamlPlayoutContext(new Playout(), definition, 1);
+        }
+
+        [Test]
+        public void Switching_Should_Not_Leak_Graphics_Elements_Across_Lists()
+        {
+            YamlPlayoutContext context = CreateContext();
+
+            // default playout turns a graphics element on
+            context.SetGraphicsElement(1, null);
+            context.GetGraphicsElements().ShouldContainKey(1);
+
+            // crossing into the schedule should start with a clean ambient state
+            context.SwitchToSchedule("Christmas");
+            context.GetGraphicsElements().ShouldNotContainKey(1);
+
+            // the schedule can turn on the same element without throwing
+            Should.NotThrow(() => context.SetGraphicsElement(1, null));
+            context.GetGraphicsElements().ShouldContainKey(1);
+        }
+
+        [Test]
+        public void Returning_To_Default_Should_Restore_Its_Graphics_Elements()
+        {
+            YamlPlayoutContext context = CreateContext();
+
+            context.SetGraphicsElement(1, "default-vars");
+            context.SwitchToSchedule("Christmas");
+            context.SetGraphicsElement(1, "christmas-vars");
+
+            // returning to the default playout restores its ambient state
+            context.SwitchToSchedule(null);
+            context.GetGraphicsElements().ShouldContainKey(1);
+            context.GetGraphicsElements()[1].ShouldBe("default-vars");
+        }
+
+        [Test]
+        public void SetGraphicsElement_Should_Be_Idempotent()
+        {
+            YamlPlayoutContext context = CreateContext();
+
+            context.SetGraphicsElement(1, "a");
+            Should.NotThrow(() => context.SetGraphicsElement(1, "b"));
+            context.GetGraphicsElements()[1].ShouldBe("b");
+        }
+    }
+}