How can I use pytest-mock for testing my Python code?

How can I use pytest-mock for testing my Python code?

You can use pytest-mock to easily create mock objects in your tests. It provides a simple interface to replace parts of your system under test.

Can you give me an example of mocking a function?

Sure! You can use the mocker fixture to mock a function like this:

def test_my_function(mocker):
    mock_function = mocker.patch('module.function_to_mock')
    mock_function.return_value = 'mocked value'
    assert my_function() == 'expected result'

What if I want to assert that the mock was called?

You can use mock_function.assert_called_once() to ensure that the mock was called exactly once during the test.

Are there any best practices for using pytest-mock?

Yes, keep your tests isolated, avoid mocking too much, and ensure your mocks are as close to the real behavior as possible.