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31. Mocking and Patching

Mocking replaces parts of the system under test with controlled objects.

Using unittest.mock​

from unittest.mock import patch

def get_data():
    import requests
    return requests.get("http://example.com").text

@patch("requests.get")
def test_get_data(mock_get):
    mock_get.return_value.text = "mocked"
    assert get_data() == "mocked"

Wrap-Up​

Mocking allows isolating code under test from external dependencies.