def add(self, elem, replace=False):
        """Add a requirement.

        :param elem: a string or :class:`Requirement` instance.
        :param replace: if `True`, packages in the set with the same name will
            be removed first.
        """
        if isinstance(elem, text_type):
            elem = Requirement.coerce(elem)
        if replace and elem in self:
            self.remove(elem)
        super(Requirements, self).add(elem)
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