Add test coverage

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

@@ -0,0 +1,60 @@
+// 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.Allocation;
+using osu.Game.Beatmaps;
+using osu.Game.Online.Multiplayer;
+using osu.Game.Rulesets;
+using osu.Game.Screens.Multi;
+using osu.Game.Users;
+
+namespace osu.Game.Tests.Visual.Multiplayer
+{
+    public class RoomManagerTestScene : MultiplayerTestScene
+    {
+        [Cached(Type = typeof(IRoomManager))]
+        protected TestRoomManager RoomManager { get; } = new TestRoomManager();
+
+        public override void SetUpSteps()
+        {
+            base.SetUpSteps();
+
+            AddStep("clear rooms", () => RoomManager.Rooms.Clear());
+        }
+
+        protected void AddRooms(int count, RulesetInfo ruleset = null)
+        {
+            AddStep("add rooms", () =>
+            {
+                for (int i = 0; i < count; i++)
+                {
+                    var room = new Room
+                    {
+                        RoomID = { Value = i },
+                        Name = { Value = $"Room {i}" },
+                        Host = { Value = new User { Username = "Host" } },
+                        EndDate = { Value = DateTimeOffset.Now + TimeSpan.FromSeconds(10) }
+                    };
+
+                    if (ruleset != null)
+                    {
+                        room.Playlist.Add(new PlaylistItem
+                        {
+                            Ruleset = { Value = ruleset },
+                            Beatmap =
+                            {
+                                Value = new BeatmapInfo
+                                {
+                                    Metadata = new BeatmapMetadata()
+                                }
+                            }
+                        });
+                    }
+
+                    RoomManager.Rooms.Add(room);
+                }
+            });
+        }
+    }
+}