pytest fixture remove codemod

A LibCST codemod to remove pytest fixtures applied via the usefixtures decorator, as well as its parametrizations.

[!NOTE] Only fixture usage will be removed, not its definition.

Usage

This package requires Python >= 3.8.

Install from PyPI.

pip install pytest-fixture-remover

Run against your tests, specifying a fixture to remove.

python -m libcst.tool codemod -x pytest_fixture_remover.RemovePytestFixtureCommand my_project_tests/ --name clean_db

Add --no-format option to stop LibCST from running Black against modified code.

Before/after examples can be found in the tests.test_command module.

Note on formatting

This codemod assumes that the target code is formatted with Black using the magic trailing comma. It may change the existing formatting in several ways:

1. When removing a fixture name from the usefixtures call.
2. When removing a value that parametrizes the fixture via parametrize.

In both cases the behavior is the same and obeys the following rules:

1. If there's only one item left after modifying, remove the trailing comma.
2. If there are multiple items left after modifying and the removed item was the last, preserve the last item's comma (or its absence).