Add failing test coverage of gameplay sample pausing (during seek)

osu.Game.Tests/Visual/Gameplay/TestSceneGameplaySamplePlayback.cs

@@ -0,0 +1,61 @@
+// 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.Linq;
+using NUnit.Framework;
+using osu.Framework.Graphics.Audio;
+using osu.Framework.Testing;
+using osu.Game.Rulesets;
+using osu.Game.Rulesets.Osu;
+using osu.Game.Rulesets.Osu.Objects.Drawables;
+using osu.Game.Rulesets.UI;
+using osu.Game.Screens.Play;
+using osu.Game.Skinning;
+
+namespace osu.Game.Tests.Visual.Gameplay
+{
+    public class TestSceneGameplaySamplePlayback : PlayerTestScene
+    {
+        [Test]
+        public void TestAllSamplesStopDuringSeek()
+        {
+            DrawableSlider slider = null;
+            DrawableSample[] samples = null;
+            ISamplePlaybackDisabler gameplayClock = null;
+
+            AddStep("get variables", () =>
+            {
+                gameplayClock = Player.ChildrenOfType<FrameStabilityContainer>().First().GameplayClock;
+                slider = Player.ChildrenOfType<DrawableSlider>().OrderBy(s => s.HitObject.StartTime).First();
+                samples = slider.ChildrenOfType<DrawableSample>().ToArray();
+            });
+
+            AddUntilStep("wait for slider sliding then seek", () =>
+            {
+                if (!slider.Tracking.Value)
+                    return false;
+
+                if (!samples.Any(s => s.Playing))
+                    return false;
+
+                Player.ChildrenOfType<GameplayClockContainer>().First().Seek(40000);
+                return true;
+            });
+
+            AddAssert("sample playback disabled", () => gameplayClock.SamplePlaybackDisabled.Value);
+
+            // because we are in frame stable context, it's quite likely that not all samples are "played" at this point.
+            // the important thing is that at least one started, and that sample has since stopped.
+            AddAssert("no samples are playing", () => Player.ChildrenOfType<PausableSkinnableSound>().All(s => !s.IsPlaying));
+
+            AddAssert("sample playback still disabled", () => gameplayClock.SamplePlaybackDisabled.Value);
+
+            AddUntilStep("seek finished, sample playback enabled", () => !gameplayClock.SamplePlaybackDisabled.Value);
+            AddUntilStep("any sample is playing", () => Player.ChildrenOfType<PausableSkinnableSound>().Any(s => s.IsPlaying));
+        }
+
+        protected override bool Autoplay => true;
+
+        protected override Ruleset CreatePlayerRuleset() => new OsuRuleset();
+    }
+}