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_when_no_users_returned_no_data_should_be_returned(verbose):
    expected_users = {} if verbose else []
    with patch.dict(
        pdbedit.__salt__,
        {
            "cmd.run_all": MagicMock(
                return_value={"stdout": "", "stderr": "", "retcode": 0}
            )
        },
    ):
        actual_users = pdbedit.list_users(verbose=verbose)

    assert actual_users == expected_users