just check isinstance

selfdrive/car/docs_definitions.py

@@ -70,7 +70,6 @@ class HarnessConnector(CarPart):
   mazda_connector = "Mazda connector"
   ford_q3_connector = "Ford Q3 connector"
   ford_q4_connector = "Ford Q4 connector"
-  none_connector = "None connector"
 
 
 class HarnessAccessory(CarPart):

selfdrive/car/tests/test_docs.py

@@ -75,8 +75,8 @@ class TestCarDocs(unittest.TestCase):
           raise unittest.SkipTest
 
         self.assertTrue(len(car.car_parts.parts) > 0, f"Need to specify car parts: {car.name}")
-        self.assertTrue(len(list(filter(lambda p: p.__class__ is HarnessConnector and p is not HarnessConnector.none_connector, car.car_parts.parts))) > 0, f"Need to specify an harness connector: {car.name}")
-        self.assertTrue(len(list(filter(lambda p: p.__class__ is Mount, car.car_parts.parts))) > 0, f"Need to specify a mount: {car.name}")
+        self.assertTrue(any([isinstance(p, HarnessConnector) for p in car.car_parts.parts]), f"Need to specify a harness connector: {car.name}")
+        self.assertTrue(any([isinstance(p, Mount) for p in car.car_parts.parts]), f"Need to specify a mount: {car.name}")
 
 
 if __name__ == "__main__":