Hi team, I’m currently having some issues with mocking with pants Currently I’m using

unittest.mock.patch

to mock, but it works when testing with pytests but not pants, I am wondering if there’s extra setup required to mock external apis with pants

conftest.py

@pytest.fixture(scope="session")
def mock_api():
   mock_get_response_patcher = patch("some-api")
   mock_get_response = mock_get_response_patcher.start()
   mock_get_response.return_value = {....}

Then in my test, I have

A.py

def test_A(..., mock_api):
   .....
   irrelevant code
   .....

I have verified the mock_api function is called correctly, but when I test it with pants, the mock function is called, but the

mock_get_response

value is not what I expected, and it will actually call the mocked function instead of returning the value I set it to be. However, when testing it with pytest, it works perfectly(it actually mocks), so I wonder if I had missed anything?

There's not much to go on here except session scope. It does not mean the same thing in Pants as under pytest since Pants runs 1 session per test file. If that sounds like it could be related to you given your mocking setup, then that's the issue.

yeah, but currently I just use

pytest A.py

and

./pants test --force A.py

to run a single file though, why is there difference

Ok, then something else. There should be nothing special about Pants here. I think you'll need to provide a repro example.

Resolved, this turned out is not a pants issue