PyTest fails on a directory with multiple test files when modularizing fixtures

You use the fixtures slightly improperly.

Specifically, you declare multiple fixtures of the same name and with the same function-object, but detected at different modules. From the pytest point of view, these should be the separate functions, because pytest does dir(module) to detect the tests & fixtures in the file. But somehow due to the same function-object, I think, pytest remembers them as the same; so once you get to the second test file, it tries the locally detected fixture name, but finds it already prepared and fails.

The proper use would be to create a pseudo-plugin conftest.py, and put all the fixtures there. Once declared, these fixtures will be available to all files in that dir and all sub-dirs.

Note: such fixtures must NOT be imported into the test files. The fixtures are NOT the functions. Pytest automatically prepares them and feeds them to the tests.

# tests/conftest.pyimport pytestfrom flask_app import create_app@pytest.fixtures(scope="session")def app(request):    app = create_app()    with app.app_context():        yield app@pytest.fixture(scope="session"):def client(request, app):    client = app.test_client()    return client

And the test files (note the absence of the imports!):

# tests/test_1.pydef test_1(client):    # test body# tests/test_2.pydef test_2(client):    # test body

See more: https://docs.pytest.org/en/latest/writing_plugins.html

If you are using an application instance then this will work for you:

import osimport tempfileimport pytestfrom my_app import app, db@pytest.fixturedef client():    db_fd, app.config["DATABASE"] = tempfile.mkstemp()    app.config["TESTING"] = True    with app.app_context():        db.init_app(app)    yield app    os.close(db_fd)    os.unlink(app.config["DATABASE"])@pytest.fixturedef client(request):    client = app.test_client()    return client