Mocking function within a function pytest?

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def func1():
    return 5
    
def func2(param1, param2):
    
    var1 = func1()
    return param1 + param2 + var1

I want to use pytest to test the second function by mocking the first, but I am not sure how to do this.

@pytest.fixture(autouse=True)
def patch_func1(self):
    with mock.patch(
        "func1",
        return_value= 5,
    ) as self.mock_func1:
        yield

I think it can be done with a dependency injection and fixture as above but that would mean changing func1 which I would prefer not to do.

pytest python-3.x function python
1 Answers

You don't need to change anything.

You can use mocker fixture with pytest (requires installation of pytest-mock). don't worry about the mocker argument, it will magically work.

def test_func2(mocker):
    mocked_value = 4
    first = 1
    second = 2
    func1_mock = mocker.patch("func1")
    func1_mock.return_value = mocked_value
    actual_value = func2(first, second)
    assert actual_value == first + second + mocked_value
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