diff --git a/osu.Game.Tests/Online/TestDummyAPIRequestHandling.cs b/osu.Game.Tests/Online/TestDummyAPIRequestHandling.cs
new file mode 100644
index 0000000000..bf3e1204d7
--- /dev/null
+++ b/osu.Game.Tests/Online/TestDummyAPIRequestHandling.cs
@@ -0,0 +1,39 @@
+// 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 osu.Game.Online.API;
+using osu.Game.Online.API.Requests;
+using osu.Game.Online.API.Requests.Responses;
+using osu.Game.Tests.Visual;
+
+namespace osu.Game.Tests.Online
+{
+    public class TestDummyAPIRequestHandling : OsuTestScene
+    {
+        public TestDummyAPIRequestHandling()
+        {
+            AddStep("register request handling", () => ((DummyAPIAccess)API).HandleRequest = req =>
+            {
+                switch (req)
+                {
+                    case CommentVoteRequest cRequest:
+                        cRequest.TriggerSuccess(new CommentBundle());
+                        break;
+                }
+            });
+
+            CommentVoteRequest request = null;
+            CommentBundle response = null;
+
+            AddStep("fire request", () =>
+            {
+                response = null;
+                request = new CommentVoteRequest(1, CommentVoteAction.Vote);
+                request.Success += res => response = res;
+                API.Queue(request);
+            });
+
+            AddAssert("got response", () => response != null);
+        }
+    }
+}
diff --git a/osu.Game/Online/API/APIRequest.cs b/osu.Game/Online/API/APIRequest.cs
index 6a6c7b72a8..1f0eae4965 100644
--- a/osu.Game/Online/API/APIRequest.cs
+++ b/osu.Game/Online/API/APIRequest.cs
@@ -30,6 +30,8 @@ namespace osu.Game.Online.API
         /// This will be scheduled to the API's internal scheduler (run on update thread automatically).
         /// </summary>
         public new event APISuccessHandler<T> Success;
+
+        internal void TriggerSuccess(T result) => Success?.Invoke(result);
     }
 
     /// <summary>
diff --git a/osu.Game/Online/API/DummyAPIAccess.cs b/osu.Game/Online/API/DummyAPIAccess.cs
index a1c3475fd9..fa5ad115d2 100644
--- a/osu.Game/Online/API/DummyAPIAccess.cs
+++ b/osu.Game/Online/API/DummyAPIAccess.cs
@@ -1,6 +1,7 @@
 // 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 System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
@@ -30,6 +31,11 @@ namespace osu.Game.Online.API
 
         private readonly List<IOnlineComponent> components = new List<IOnlineComponent>();
 
+        /// <summary>
+        /// Provide handling logic for an arbitrary API request.
+        /// </summary>
+        public Action<APIRequest> HandleRequest;
+
         public APIState State
         {
             get => state;
@@ -55,6 +61,7 @@ namespace osu.Game.Online.API
 
         public virtual void Queue(APIRequest request)
         {
+            HandleRequest?.Invoke(request);
         }
 
         public void Perform(APIRequest request) { }