What is pytest-mock and how do I use it?

What is pytest-mock and how do I use it?

pytest-mock is a plugin for pytest that simplifies mocking in your tests. It provides a convenient way to replace parts of your system under test and make assertions about how they have been used.

Can you give me an example of how to mock a function using pytest-mock?

Sure! You can use the mocker fixture to mock a function. For example:

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

What are some common use cases for pytest-mock?

Common use cases include mocking external APIs, database calls, or any function that you want to isolate during testing.