diff --git a/tests/src/IrcMessageHandler.cpp b/tests/src/IrcMessageHandler.cpp
index 8a0013e5..14790e7c 100644
--- a/tests/src/IrcMessageHandler.cpp
+++ b/tests/src/IrcMessageHandler.cpp
@@ -603,7 +603,11 @@ TEST_P(TestIrcMessageHandlerP, Run)
 
     delete ircMessage;
 
-    ASSERT_TRUE(snapshot->run(got, UPDATE_SNAPSHOTS));
+    ASSERT_TRUE(snapshot->run(got, UPDATE_SNAPSHOTS))
+        << "Snapshot " << snapshot->name() << " failed. Expected JSON to be\n"
+        << QJsonDocument::fromVariant(snapshot->output().toVariant()).toJson()
+        << "\nbut got\n"
+        << QJsonDocument(got).toJson() << "\ninstead.";
 }
 
 INSTANTIATE_TEST_SUITE_P(