Method __exit__

src/flask/testing.py:255–262

(
        self,
        exc_type: type | None,
        exc_value: BaseException | None,
        tb: TracebackType | None,
    )

        return self

    def __exit__(
        self,
        exc_type: type | None,
        exc_value: BaseException | None,
        tb: TracebackType | None,
    ) -> None:
        self.preserve_context = False
        self._context_stack.close()


class FlaskCliRunner(CliRunner):