What are some examples of using pytest-mock?

Can you give me some examples of using pytest-mock?

Sure! pytest-mock is a plugin for pytest that allows you to easily mock objects in your tests. For example, you can use it to mock a function call.

How do I mock a function with pytest-mock?

You can use the mocker fixture provided by pytest-mock. For instance, mocker.patch('module.function') will replace function with a mock.

Can you show me a complete example?

Absolutely! Here's a simple example:

from my_module import function_to_test

def test_function(mocker):
    mock_function = mocker.patch('my_module.external_function')
    mock_function.return_value = 'mocked value'
    result = function_to_test()
    assert result == 'expected value'

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

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