And then everything became one

osu.Game/Tests/Visual/TestCaseChatDisplay.cs

@@ -0,0 +1,21 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Framework.Graphics.Containers;
+using osu.Game.Overlays;
+
+namespace osu.Game.Tests.Visual
+{
+    internal class TestCaseChatDisplay : OsuTestCase
+    {
+        public override string Description => @"Testing chat api and overlay";
+
+        public TestCaseChatDisplay()
+        {
+            Add(new ChatOverlay
+            {
+                State = Visibility.Visible
+            });
+        }
+    }
+}