Add failing test case

osu.Game.Tests/NonVisual/Skinning/LegacySkinAnimationTest.cs

@@ -0,0 +1,79 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Audio.Sample;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Animations;
+using osu.Framework.Graphics.OpenGL.Textures;
+using osu.Framework.Graphics.Textures;
+using osu.Framework.Testing;
+using osu.Framework.Timing;
+using osu.Game.Audio;
+using osu.Game.Skinning;
+using osu.Game.Tests.Visual;
+
+namespace osu.Game.Tests.NonVisual.Skinning
+{
+    [HeadlessTest]
+    public class LegacySkinAnimationTest : OsuTestScene
+    {
+        private const string animation_name = "animation";
+        private const int frame_count = 6;
+
+        [Cached(typeof(IAnimationTimeReference))]
+        private TestAnimationTimeReference animationTimeReference = new TestAnimationTimeReference();
+
+        private TextureAnimation animation;
+
+        [Test]
+        public void TestAnimationTimeReferenceChange()
+        {
+            ISkin skin = new TestSkin();
+
+            AddStep("get animation", () => Add(animation = (TextureAnimation)skin.GetAnimation(animation_name, true, false)));
+            AddAssert("frame count correct", () => animation.FrameCount == frame_count);
+            assertPlaybackPosition(0);
+
+            AddStep("set start time to 1000", () => animationTimeReference.AnimationStartTime = 1000);
+            assertPlaybackPosition(-1000);
+
+            AddStep("set current time to 500", () => animationTimeReference.ManualClock.CurrentTime = 500);
+            assertPlaybackPosition(-500);
+        }
+
+        private void assertPlaybackPosition(double expectedPosition)
+            => AddAssert($"playback position is {expectedPosition}", () => animation.PlaybackPosition == expectedPosition);
+
+        private class TestSkin : ISkin
+        {
+            private static readonly string[] lookup_names = Enumerable.Range(0, frame_count).Select(frame => $"{animation_name}-{frame}").ToArray();
+
+            public Texture GetTexture(string componentName, WrapMode wrapModeS, WrapMode wrapModeT)
+            {
+                return lookup_names.Contains(componentName) ? Texture.WhitePixel : null;
+            }
+
+            public Drawable GetDrawableComponent(ISkinComponent component) => throw new NotSupportedException();
+            public SampleChannel GetSample(ISampleInfo sampleInfo) => throw new NotSupportedException();
+            public IBindable<TValue> GetConfig<TLookup, TValue>(TLookup lookup) => throw new NotSupportedException();
+        }
+
+        private class TestAnimationTimeReference : IAnimationTimeReference
+        {
+            public ManualClock ManualClock { get; }
+            public IFrameBasedClock Clock { get; }
+            public double AnimationStartTime { get; set; }
+
+            public TestAnimationTimeReference()
+            {
+                ManualClock = new ManualClock();
+                Clock = new FramedClock(ManualClock);
+            }
+        }
+    }
+}