Add test for bar line application

osu.Game.Rulesets.Taiko.Tests/TestBarLineApplication.cs

@@ -0,0 +1,34 @@
+// 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 NUnit.Framework;
+using osu.Game.Rulesets.Taiko.Objects;
+using osu.Game.Rulesets.Taiko.Objects.Drawables;
+
+namespace osu.Game.Rulesets.Taiko.Tests
+{
+    public class TestBarLineApplication : HitObjectApplicationTestScene
+    {
+        [Test]
+        public void TestApplyNewBarLine()
+        {
+            DrawableBarLine barLine = null;
+
+            AddHitObject(() => barLine = new DrawableBarLine(PrepareObject(new BarLine
+            {
+                StartTime = 400,
+                Major = true
+            })));
+
+            RemoveHitObject(() => barLine);
+
+            AddStep("apply new bar line", () => barLine.Apply(PrepareObject(new BarLine
+            {
+                StartTime = 200,
+                Major = false
+            }), null));
+
+            AddHitObject(() => barLine);
+        }
+    }
+}