from typing import Optional from typing import Union import pytest from _pytest.config import Config from _pytest.config import ExitCode from _pytest.config.argparsing import Parser from _pytest.fixtures import FixtureDef from _pytest.fixtures import SubRequest def pytest_addoption(parser: Parser) -> None: group = parser.getgroup("debugconfig") group.addoption( "--setupplan", "--setup-plan", action="store_true", help="Show what fixtures and tests would be executed but " "don't execute anything", ) @pytest.hookimpl(tryfirst=True) def pytest_fixture_setup( fixturedef: FixtureDef[object], request: SubRequest ) -> Optional[object]: # Will return a dummy fixture if the setuponly option is provided. if request.config.option.setupplan: my_cache_key = fixturedef.cache_key(request) fixturedef.cached_result = (None, my_cache_key, None) return fixturedef.cached_result return None @pytest.hookimpl(tryfirst=True) def pytest_cmdline_main(config: Config) -> Optional[Union[int, ExitCode]]: if config.option.setupplan: config.option.setuponly = True config.option.setupshow = True return None