Python Testing with pytest

Parametrizing Fixtures

When we used function parametrization, pytest called our test function once each for every set of argument values we provided. With fixture parametrization, we shift those parameters to a fixture. pytest will then call the fixture once each for every set of values we provide. Then downstream, every test function that depends on the fixture will be called, once each for every fixture value.

Also, the syntax is different:

ch5/test_fix_param.py

@pytest.fixture(params=["done", "in prog", "todo"])
def start_state(request):
    return request.param


def test_finish(cards_db, start_state):
    c = Card("write a book", state=start_state)
    index = cards_db.add_card(c)
    cards_db.finish(index)
 card = cards_db.get_card(index) ...