Try

Author: bouwew

tests/test_usb.py

@@ -366,7 +366,7 @@ async def test_stick_connect_without_port(self) -> None:
 
         with pytest.raises(pw_exceptions.StickError):
             await stick.connect()
-        stick.port = "null"
+        stick.port = None
         with pytest.raises(pw_exceptions.StickError):
             await stick.connect()
         await stick.disconnect()