Add missing coverage for SignalRegistrationInterface (#758)

bdraco · web-flow · commit 9f68fc8b1b83 · 2021-06-19T14:38:41.000-10:00
diff --git a/tests/test_services.py b/tests/test_services.py
@@ -275,3 +275,18 @@ class MyPartialListener(r.ServiceListener):
         )
 
     zc.close()
+
+
+def test_signal_registration_interface():
+    """Test adding and removing from the SignalRegistrationInterface."""
+
+    interface = r.SignalRegistrationInterface([])
+
+    def dummy():
+        pass
+
+    interface.register_handler(dummy)
+    interface.unregister_handler(dummy)
+
+    with pytest.raises(ValueError):
+        interface.unregister_handler(dummy)
