Add grouping of visual tests

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

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+// 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 NUnit.Framework;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Screens.Edit.Setup.Components.LabelledComponents;
+
+namespace osu.Game.Tests.Visual.UserInterface
+{
+    [TestFixture]
+    public class TestCaseLabelledTextBox : OsuTestCase
+    {
+        public override IReadOnlyList<Type> RequiredTypes => new[]
+        {
+            typeof(LabelledTextBox),
+        };
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            Child = new Container
+            {
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                RelativeSizeAxes = Axes.X,
+                Padding = new MarginPadding { Left = 150, Right = 150 },
+                Child = new LabelledTextBox
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    LabelText = "Testing text",
+                    PlaceholderText = "This is definitely working as intended",
+                }
+            };
+        }
+    }
+}