Add failing test case

osu.Game.Tests/Visual/Editing/TestSceneEditorScreenModes.cs

@@ -0,0 +1,29 @@
+// 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.Testing;
+using osu.Game.Rulesets;
+using osu.Game.Rulesets.Osu;
+using osu.Game.Screens.Edit;
+using osu.Game.Screens.Edit.Components.Menus;
+
+namespace osu.Game.Tests.Visual.Editing
+{
+    public class TestSceneEditorScreenModes : EditorTestScene
+    {
+        protected override Ruleset CreateEditorRuleset() => new OsuRuleset();
+
+        [Test]
+        public void TestSwitchScreensInstantaneously()
+        {
+            AddStep("switch between all screens at once", () =>
+            {
+                foreach (var screen in Enum.GetValues(typeof(EditorScreenMode)).Cast<EditorScreenMode>())
+                    Editor.ChildrenOfType<EditorMenuBar>().Single().Mode.Value = screen;
+            });
+        }
+    }
+}