Howdy!

I've found that mixing Python's unittest.mock.patch decorator with parameterized.expand leads to unfortunate side-effects.

@parameterized.expand([("x", "y"),])
@patch("foo")
def test_bar(foo, x, y):
   pass

Will lead to UnboundLocalError: local variable 'patching' referenced before assignment (at unittest\mock.py:1181).
I'm sure this is due to the nature of how expand generates test cases.

There's a workaround, which is use patch as a context manager in the test body. However, I'd still love to use both as decorators for all that delicious syntactic sugar and saved whitespace 😄.