def load(self, requirements_file=None):
        """Load or reload requirements from a requirements.txt file.

        :param requirements_file: if not given, the filename used from
            initialization will be read again.
        """
        if requirements_file is None:
            requirements_file = self.filename
            if requirements_file is None:
                raise ValueError("no filename provided")
        elif isinstance(requirements_file, text_type):
            requirements_file = Path(requirements_file)
        self.clear()
        with requirements_file.open() as f:
            self.loads(f.read())

        if isinstance(requirements_file, (text_type, Path)):
            self.filename = requirements_file
def test_call_with_kwargs(self):
        mock_scope_func = Mock()
        SessionMaker = sa.orm.sessionmaker()
        Session = scoped_session(sa.orm.sessionmaker(), mock_scope_func)

        s0 = SessionMaker()
        assert s0.autoflush == True

        mock_scope_func.return_value = 0
        s1 = Session()
        assert s1.autoflush == True

        assert_raises_message(
            sa.exc.InvalidRequestError,
            "Scoped session is already present",
            Session,
            autoflush=False,
        )

        mock_scope_func.return_value = 1
        s2 = Session(autoflush=False)
        assert s2.autoflush == False