Class PytestPluginManager

src/_pytest/config/__init__.py:460–927

A :py:class:`pluggy.PluginManager <pluggy.PluginManager>` with additional pytest-specific functionality: * Loading plugins from the command line, ``PYTEST_PLUGINS`` env variable and ``pytest_plugins`` global variables found in plugins being loaded. * ``conftest.py`` loading during

@final
class PytestPluginManager(PluginManager):
    """A :py:class:`pluggy.PluginManager <pluggy.PluginManager>` with
    additional pytest-specific functionality:

    * Loading plugins from the command line, ``PYTEST_PLUGINS`` env variable and
      ``pytest_plugins`` global variables found in plugins being loaded.
    * ``conftest.py`` loading during start-up.
    """

    def __init__(self) -> None:
        from _pytest.assertion import DummyRewriteHook
        from _pytest.assertion import RewriteHook

        super().__init__("pytest")

        # -- State related to local conftest plugins.
        # All loaded conftest modules.
        self._conftest_plugins: set[types.ModuleType] = set()
        # All conftest modules applicable for a directory.
        # This includes the directory's own conftest modules as well
        # as those of its parent directories.
        self._dirpath2confmods: dict[pathlib.Path, list[types.ModuleType]] = {}
        # Cutoff directory above which conftests are no longer discovered.
        self._confcutdir: pathlib.Path | None = None
        # If set, conftest loading is skipped.
        self._noconftest = False

        # _getconftestmodules()'s call to _get_directory() causes a stat
        # storm when it's called potentially thousands of times in a test
        # session (#9478), often with the same path, so cache it.
        self._get_directory = lru_cache(256)(_get_directory)

        # plugins that were explicitly skipped with pytest.skip
        # list of (module name, skip reason)
        # previously we would issue a warning when a plugin was skipped, but
        # since we refactored warnings as first citizens of Config, they are
        # just stored here to be used later.
        self.skipped_plugins: list[tuple[str, str]] = []

        self.add_hookspecs(_pytest.hookspec)
        self.register(self)
        if os.environ.get("PYTEST_DEBUG"):
            err: IO[str] = sys.stderr
            encoding: str = getattr(err, "encoding", "utf8")
            try:
                err = open(
                    os.dup(err.fileno()),
                    mode=err.mode,
                    buffering=1,
                    encoding=encoding,
                )
            except Exception:
                pass
            self.trace.root.setwriter(err.write)
            self.enable_tracing()

        # Config._consider_importhook will set a real object if required.
        self.rewrite_hook: RewriteHook = DummyRewriteHook()