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_filter_factory(self):
        factory = memcache.filter_factory({'max_connections': '3'},
                                          memcache_servers='10.10.10.10:10',
                                          memcache_serialization_support='1')
        thefilter = factory('myapp')
        self.assertEqual(thefilter.app, 'myapp')
        self.assertEqual(thefilter.memcache_servers, '10.10.10.10:10')
        self.assertEqual(thefilter.memcache._allow_pickle, False)
        self.assertEqual(thefilter.memcache._allow_unpickle, True)
        self.assertEqual(
            thefilter.memcache._client_cache['10.10.10.10:10'].max_size, 3)