Fix test failure due to channel not being joined

osu.Game.Tournament.Tests/Components/TestSceneTournamentMatchChatDisplay.cs

@@ -6,6 +6,8 @@ using NUnit.Framework;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Testing;
+using osu.Game.Online.API;
+using osu.Game.Online.API.Requests;
 using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Online.Chat;
 using osu.Game.Overlays.Chat;
@@ -61,14 +63,33 @@ namespace osu.Game.Tournament.Tests.Components
                 Anchor = Anchor.Centre,
                 Origin = Anchor.Centre,
             });
-
-            chatDisplay.Channel.Value = testChannel;
         }
 
         protected override void LoadComplete()
         {
             base.LoadComplete();
 
+            AddStep("set up API", () =>
+            {
+                ((DummyAPIAccess)API).HandleRequest = req =>
+                {
+                    switch (req)
+                    {
+                        case JoinChannelRequest joinChannelRequest:
+                            joinChannelRequest.TriggerSuccess();
+                            return true;
+
+                        case LeaveChannelRequest leaveChannelRequest:
+                            leaveChannelRequest.TriggerSuccess();
+                            return true;
+
+                        default:
+                            return false;
+                    }
+                };
+            });
+            AddStep("set channel", () => chatDisplay.Channel.Value = testChannel);
+
             AddStep("message from admin", () => testChannel.AddNewMessages(new Message(nextMessageId())
             {
                 Sender = admin,

osu.Game/Properties/AssemblyInfo.cs

@@ -11,6 +11,7 @@ using System.Runtime.CompilerServices;
 [assembly: InternalsVisibleTo("osu.Game.Tests.Dynamic")]
 [assembly: InternalsVisibleTo("osu.Game.Tests.iOS")]
 [assembly: InternalsVisibleTo("osu.Game.Tests.Android")]
+[assembly: InternalsVisibleTo("osu.Game.Tournament.Tests")]
 
 // intended for Moq usage
 [assembly: InternalsVisibleTo("DynamicProxyGenAssembly2")]