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_should_encode_map(self):
        encoded = cypher_repr(OrderedDict([("one", 1), ("two", 2.0), ("number three", u"three")]))
        assert encoded == u"{one: 1, two: 2.0, `number three`: 'three'}"