Python Testing with pytest

Using Complex Values

Sometimes you might want to parametrize using data structures or objects as values. Let’s start with a string value parametrization from Chapter 5, ​Parametrization​, and modify it to use Cards objects.

Here’s the function parametrization we used earlier in Chapter 5:

ch16/test_ids.py

@pytest.mark.parametrize("start_state", ["done", "in prog", "todo"])
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)
    assert card.state == "done"

This code includes one parameter, start_state, with string values statically listed in the parametrize() decorator.

This results in test node names that ...