move song progress graph to its own test scene

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

@@ -0,0 +1,73 @@
+// 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 System.Collections.Generic;
+using NUnit.Framework;
+using osu.Framework.Graphics;
+using osu.Framework.Testing;
+using osu.Framework.Utils;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Screens.Play.HUD;
+
+namespace osu.Game.Tests.Visual.Gameplay
+{
+    [TestFixture]
+    public class TestSceneSongProgressGraph : OsuTestScene
+    {
+        private TestSongProgressGraph graph;
+
+        [SetUpSteps]
+        public void SetupSteps()
+        {
+            AddStep("add new big graph", () =>
+            {
+                if (graph != null)
+                {
+                    graph.Expire();
+                    graph = null;
+                }
+
+                Add(graph = new TestSongProgressGraph
+                {
+                    RelativeSizeAxes = Axes.X,
+                    Height = 200,
+                    Anchor = Anchor.TopLeft,
+                    Origin = Anchor.TopLeft,
+                });
+            });
+        }
+
+        [Test]
+        public void TestGraphRecreation()
+        {
+            AddAssert("ensure not created", () => graph.CreationCount == 0);
+            AddStep("display values", displayRandomValues);
+            AddUntilStep("wait for creation count", () => graph.CreationCount == 1);
+            AddRepeatStep("new values", displayRandomValues, 5);
+            AddWaitStep("wait some", 5);
+            AddAssert("ensure recreation debounced", () => graph.CreationCount == 2);
+        }
+
+        private void displayRandomValues()
+        {
+            var objects = new List<HitObject>();
+            for (double i = 0; i < 5000; i += RNG.NextDouble() * 10 + i / 1000)
+                objects.Add(new HitObject { StartTime = i });
+
+            graph.Objects = objects;
+        }
+
+        private class TestSongProgressGraph : SongProgressGraph
+        {
+            public int CreationCount { get; private set; }
+
+            protected override void RecreateGraph()
+            {
+                base.RecreateGraph();
+                CreationCount++;
+            }
+        }
+    }
+}