Method __init__

src/_pytest/pytester.py:669–713

(
        self,
        request: FixtureRequest,
        tmp_path_factory: TempPathFactory,
        monkeypatch: MonkeyPatch,
        *,
        _ispytest: bool = False,
    )

        pass

    def __init__(
        self,
        request: FixtureRequest,
        tmp_path_factory: TempPathFactory,
        monkeypatch: MonkeyPatch,
        *,
        _ispytest: bool = False,
    ) -> None:
        check_ispytest(_ispytest)
        self._request = request
        self._mod_collections: WeakKeyDictionary[Collector, list[Item | Collector]] = (
            WeakKeyDictionary()
        )
        if request.function:
            name: str = request.function.__name__
        else:
            name = request.node.name
        self._name = name
        self._path: Path = tmp_path_factory.mktemp(name, numbered=True)
        #: A list of plugins to use with :py:meth:`parseconfig` and
        #: :py:meth:`runpytest`. Initially this is an empty list but plugins can
        #: be added to the list.
        #:
        #: When running in subprocess mode, specify plugins by name (str) - adding
        #: plugin objects directly is not supported.
        self.plugins: list[str | _PluggyPlugin] = []
        self._sys_path_snapshot = SysPathsSnapshot()
        self._sys_modules_snapshot = self.__take_sys_modules_snapshot()
        self._request.addfinalizer(self._finalize)
        self._method = self._request.config.getoption("--runpytest")
        self._test_tmproot = tmp_path_factory.mktemp(f"tmp-{name}", numbered=True)

        self._monkeypatch = mp = monkeypatch
        self.chdir()
        mp.setenv("PYTEST_DEBUG_TEMPROOT", str(self._test_tmproot))
        # Ensure no unexpected caching via tox.
        mp.delenv("TOX_ENV_DIR", raising=False)
        # Discard outer pytest options.
        mp.delenv("PYTEST_ADDOPTS", raising=False)
        # Ensure no user config is used.
        tmphome = str(self.path)
        mp.setenv("HOME", tmphome)
        mp.setenv("USERPROFILE", tmphome)
        # Do not use colors for inner runs by default.
        mp.setenv("PY_COLORS", "0")

    @property
    def path(self) -> Path: