Standardize tests on pytest and follow its conventions for structure and fixtures. Place tests in a `tests/` directory without an `__init__.py` (pytest treats it as a plain directory, not a package), and name test files `test_*.py` so they are auto-discovered. For setup/teardown logic, prefer `yield` fixtures over `request.addfinalizer`, since they are more concise and keep setup and teardown code together: ```python import os import tempfile import pytest from flaskr import flaskr @pytest.fixture def client(): db_fd, flaskr.app.config['DATABASE'] = tempfile.mkstemp() flaskr.app.config['TESTING'] = True client = flaskr.app.test_client() with flaskr.app.app_context(): flaskr.init_db() yield client os.close(db_fd) os.unlink(flaskr.app.config['DATABASE']) ``` Additionally, configure the test runner (e.g. `tox.ini`) to run `py.test` with coverage reporting enabled (`--cov= --cov-report html`) and keep the ability to pass through extra arguments (e.g. `py.test {posargs}`) so individual tests can be targeted from the command line.