Basic overlay layout implementation

osu.Game.Tests/Visual/Online/TestSceneDashboardOverlay.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.Game.Overlays;
+using osu.Game.Overlays.Dashboard;
+using osu.Game.Overlays.Dashboard.Friends;
+
+namespace osu.Game.Tests.Visual.Online
+{
+    public class TestSceneDashboardOverlay : OsuTestScene
+    {
+        public override IReadOnlyList<Type> RequiredTypes => new[]
+        {
+            typeof(DashboardOverlay),
+            typeof(DashboardOverlayHeader),
+            typeof(FriendDisplay)
+        };
+
+        protected override bool UseOnlineAPI => true;
+
+        private readonly DashboardOverlay overlay;
+
+        public TestSceneDashboardOverlay()
+        {
+            Add(overlay = new DashboardOverlay());
+        }
+
+        [Test]
+        public void TestShow()
+        {
+            AddStep("Show", overlay.Show);
+        }
+
+        [Test]
+        public void TestHide()
+        {
+            AddStep("Hide", overlay.Hide);
+        }
+    }
+}