Add basic multiplayer gameplay test coverage

osu.Game.Tests/Visual/Multiplayer/TestMultiplayerGameplay.cs

@@ -0,0 +1,19 @@
+// 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.Linq;
+using NUnit.Framework;
+using osu.Game.Screens.OnlinePlay.Multiplayer;
+
+namespace osu.Game.Tests.Visual.Multiplayer
+{
+    public class TestMultiplayerGameplay : MultiplayerTestScene
+    {
+        [Test]
+        public void TestBasic()
+        {
+            AddStep("load screen", () =>
+                LoadScreen(new MultiplayerPlayer(Client.CurrentMatchPlayingItem.Value, Client.Room?.Users.Select(u => u.UserID).ToArray())));
+        }
+    }
+}