Python Testing with pytest

Creating Custom Identifiers

You can define a function to generate identifiers by using the ids parameter. Often the builtin str or repr functions work fine.

Let’s try using str as an ID function:

ch16/test_ids.py

card_list = [
    Card("foo", state="todo"),
    Card("foo", state="in prog"),
    Card("foo", state="done"),
]

@pytest.mark.parametrize("starting_card", card_list, ids=str)
def test_id_str(cards_db, starting_card):
    ...

Here we added ids=str. We also moved the list of cards to a named variable to allow shorter code samples in the rest of this section.

Here’s what our node IDs look like now:

$ pytest -v test_ids.py::test_id_str
========================= test session starts ==========================