Add test coverage

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

@@ -0,0 +1,35 @@
+// 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 osu.Framework.Bindables;
+using osu.Game.Online.Multiplayer;
+using osu.Game.Screens.Multi;
+
+namespace osu.Game.Tests.Visual.Multiplayer
+{
+    public class TestRoomManager : IRoomManager
+    {
+        public event Action RoomsUpdated
+        {
+            add { }
+            remove { }
+        }
+
+        public readonly BindableList<Room> Rooms = new BindableList<Room>();
+
+        public Bindable<bool> InitialRoomsReceived { get; } = new Bindable<bool>(true);
+
+        IBindableList<Room> IRoomManager.Rooms => Rooms;
+
+        public void CreateRoom(Room room, Action<Room> onSuccess = null, Action<string> onError = null) => Rooms.Add(room);
+
+        public void JoinRoom(Room room, Action<Room> onSuccess = null, Action<string> onError = null)
+        {
+        }
+
+        public void PartRoom()
+        {
+        }
+    }
+}