Add a testcase

osu.Game.Tests/Visual/UserInterface/TestSceneToolbarRulesetSelector.cs

@@ -0,0 +1,35 @@
+// 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 osu.Framework.Graphics.Containers;
+using osu.Game.Overlays.Toolbar;
+using System;
+using System.Collections.Generic;
+using osu.Framework.Graphics;
+
+namespace osu.Game.Tests.Visual.UserInterface
+{
+    public class TestSceneToolbarRulesetSelector : OsuTestScene
+    {
+        public override IReadOnlyList<Type> RequiredTypes => new[]
+        {
+            typeof(ToolbarRulesetSelector),
+            typeof(ToolbarRulesetButton),
+        };
+
+        public TestSceneToolbarRulesetSelector()
+        {
+            ToolbarRulesetSelector selector;
+
+            Add(new Container
+            {
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                AutoSizeAxes = Axes.X,
+                Height = Toolbar.HEIGHT,
+                Child = selector = new ToolbarRulesetSelector()
+
+            });
+        }
+    }
+}

osu.Game/Overlays/Toolbar/ToolbarRulesetSelector.cs

@@ -40,7 +40,7 @@ namespace osu.Game.Overlays.Toolbar
             RelativeSizeAxes = Axes.Y;
             AutoSizeAxes = Axes.X;
 
-            AddRangeInternal(new Drawable[]
+            AddRangeInternal(new[]
             {
                 new OpaqueBackground
                 {
@@ -48,7 +48,7 @@ namespace osu.Game.Overlays.Toolbar
                 },
                 modeButtonLine = new Container
                 {
-                    Size = new Vector2(padding* 2 + ToolbarButton.WIDTH, 3),
+                    Size = new Vector2(padding * 2 + ToolbarButton.WIDTH, 3),
                     Anchor = Anchor.BottomLeft,
                     Origin = Anchor.TopLeft,
                     Masking = true,