Add grouping of visual tests

osu.Game.Tests/Visual/Menus/TestCaseToolbar.cs

@@ -0,0 +1,44 @@
+// 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.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Overlays.Toolbar;
+
+namespace osu.Game.Tests.Visual.Menus
+{
+    [TestFixture]
+    public class TestCaseToolbar : OsuTestCase
+    {
+        public override IReadOnlyList<Type> RequiredTypes => new[]
+        {
+            typeof(ToolbarButton),
+            typeof(ToolbarRulesetSelector),
+            typeof(ToolbarRulesetButton),
+            typeof(ToolbarNotificationButton),
+        };
+
+        public TestCaseToolbar()
+        {
+            var toolbar = new Toolbar { State = Visibility.Visible };
+            ToolbarNotificationButton notificationButton = null;
+
+            AddStep("create toolbar", () =>
+            {
+                Add(toolbar);
+                notificationButton = toolbar.Children.OfType<FillFlowContainer>().Last().Children.OfType<ToolbarNotificationButton>().First();
+            });
+
+            void setNotifications(int count) => AddStep($"set notification count to {count}", () => notificationButton.NotificationCount.Value = count);
+
+            setNotifications(1);
+            setNotifications(2);
+            setNotifications(3);
+            setNotifications(0);
+            setNotifications(144);
+        }
+    }
+}