Add test

osu.Game.Rulesets.Osu.Tests/TestSceneHitCircleLateFade.cs

@@ -0,0 +1,48 @@
+// 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.
+
+#nullable disable
+
+using NUnit.Framework;
+using osu.Framework.Extensions.ObjectExtensions;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Rulesets.Osu.Objects;
+using osu.Game.Rulesets.Osu.Objects.Drawables;
+using osu.Game.Tests.Visual;
+using osuTK;
+
+namespace osu.Game.Rulesets.Osu.Tests
+{
+    public partial class TestSceneHitCircleLateFade : OsuTestScene
+    {
+        [Test]
+        public void TestFadeOutIntoMiss()
+        {
+            float? alphaAtMiss = null;
+
+            AddStep("Create hit circle", () =>
+            {
+                alphaAtMiss = null;
+
+                DrawableHitCircle drawableHitCircle = new DrawableHitCircle(new HitCircle
+                {
+                    StartTime = Time.Current + 500,
+                    Position = new Vector2(250)
+                });
+
+                drawableHitCircle.HitObject.ApplyDefaults(new ControlPointInfo(), new BeatmapDifficulty());
+
+                drawableHitCircle.OnNewResult += (_, _) =>
+                {
+                    alphaAtMiss = drawableHitCircle.Alpha;
+                };
+
+                Child = drawableHitCircle;
+            });
+
+            AddUntilStep("Wait until circle is missed", () => alphaAtMiss.IsNotNull());
+            AddAssert("Transparent when missed", () => alphaAtMiss == 0);
+        }
+    }
+}