tests: Use a real signal for ConfigStub.

tests/conftest.py

@@ -147,7 +147,7 @@ def cmdline_test(request):
 @pytest.yield_fixture
 def config_stub(stubs):
     """Fixture which provides a fake config object."""
-    stub = stubs.ConfigStub(signal=stubs.FakeSignal())
+    stub = stubs.ConfigStub()
     objreg.register('config', stub)
     yield stub
     objreg.delete('config')

tests/helpers/stubs.py

@@ -274,7 +274,7 @@ class FakeTimer(QObject):
         return self._started
 
 
-class ConfigStub:
+class ConfigStub(QObject):
 
     """Stub for the config module.
 
@@ -282,14 +282,16 @@ class ConfigStub:
         data: The config data to return.
     """
 
-    def __init__(self, signal):
+    changed = pyqtSignal(str, str)
+
+    def __init__(self, parent=None):
         """Constructor.
 
         Args:
             signal: The signal to use for self.changed.
         """
+        super().__init__(parent)
         self.data = {}
-        self.changed = signal
 
     def section(self, name):
         """Get a section from the config.