Python Testing with pytest

Being Strict with Markers

Let’s say we want to add the “smoke” marker to test_start_non_existent, like we did for test_finish_non_existent. However, we happen to misspell “smoke” as “smok” like this:

ch6/bad/test_start.py

@pytest.mark.smok
@pytest.mark.exception
def test_start_non_existent(cards_db):
    """
    Shouldn't be able to start a non-existent card.
    """
    any_number = 123  # any number will be invalid, db is empty
    with pytest.raises(InvalidCardId):
        cards_db.start(any_number)

If we try to run this “smoke” test, we’ll get a familiar warning:

$ cd /path/to/code/ch6/bad
$ pytest -m smoke
========================= test session starts ==========================
collected 12 items / 5 deselected / 7 ...