Move polling clients to osu.Game.Tests namespace

osu.Game/Tests/PollingNotificationsClient.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.Threading;
+using System.Threading.Tasks;
+using osu.Game.Online.API;
+using osu.Game.Online.Notifications;
+
+namespace osu.Game.Tests
+{
+    /// <summary>
+    /// A notifications client which polls for new messages every second.
+    /// </summary>
+    public class PollingNotificationsClient : NotificationsClient
+    {
+        public PollingNotificationsClient(IAPIProvider api)
+            : base(api)
+        {
+        }
+
+        public override Task ConnectAsync(CancellationToken cancellationToken)
+        {
+            Task.Run(async () =>
+            {
+                while (!cancellationToken.IsCancellationRequested)
+                {
+                    await API.PerformAsync(CreateFetchMessagesRequest());
+                    await Task.Delay(1000, cancellationToken);
+                }
+            }, cancellationToken);
+
+            return Task.CompletedTask;
+        }
+    }
+}