Fix __qualname__ assertion on alertmanager

deluge/conftest.py

@@ -42,6 +42,9 @@ def mock_callback():
     The returned Mock instance will have a `deferred` attribute which will complete when the callback has been called.
     """
 
+    def mock_handler(self):
+        pass
+
     def reset(timeout=0.5, *args, **kwargs):
         if mock.called:
             original_reset_mock(*args, **kwargs)
@@ -52,7 +55,8 @@ def reset(timeout=0.5, *args, **kwargs):
         mock.side_effect = lambda *args, **kw: deferred.callback((args, kw))
         mock.deferred = deferred
 
-    mock = Mock()
+    mock = Mock(spec=mock_handler)
+    mock.deferred = None
     original_reset_mock = mock.reset_mock
     mock.reset_mock = reset
     mock.reset_mock()