Python Testing with pytest

Using autouse for Fixtures That Always Get Used

So far in this chapter, all of the fixtures used by tests were named by the tests or another fixture in a parameter list. However, you can use autouse=True to get a fixture to run all of the time. This works well for code you want to run at certain times, but tests don’t really depend on any system state or data from the fixture.

Here’s a rather contrived example:

ch3/test_autouse.py

import pytest
import time


@pytest.fixture(autouse=True, scope="session")
def footer_session_scope():
    """Report the time at the end of a session."""
    yield
    now = time.time()
    print("--")
    print(
        "finished : {}".format(
            time.strftime("%d %b %X", time.localtime(now)) ...