Add test scene for labelled dropdowns

osu.Game.Tests/Visual/UserInterface/TestSceneLabelledDropdown.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.Beatmaps;
+using osu.Game.Graphics.UserInterfaceV2;
+
+namespace osu.Game.Tests.Visual.UserInterface
+{
+    public class TestSceneLabelledDropdown : OsuTestScene
+    {
+        [Test]
+        public void TestLabelledDropdown()
+            => AddStep(@"create dropdown", () => Child = new LabelledDropdown<string>
+            {
+                Label = @"Countdown speed",
+                Items = new[]
+                {
+                    @"Half",
+                    @"Normal",
+                    @"Double"
+                },
+                Description = @"This is a description"
+            });
+
+        [Test]
+        public void TestLabelledEnumDropdown()
+            => AddStep(@"create dropdown", () => Child = new LabelledEnumDropdown<BeatmapSetOnlineStatus>
+            {
+                Label = @"Beatmap status",
+                Description = @"This is a description"
+            });
+    }
+}