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_conf_inline_tls(self):
        fake_context = mock.Mock()
        with mock.patch.object(ssl, 'create_default_context',
                               return_value=fake_context):
            with mock.patch.object(memcache, 'ConfigParser',
                                   get_config_parser()):
                memcache.MemcacheMiddleware(
                    FakeApp(),
                    {'tls_enabled': 'true',
                     'tls_cafile': 'cafile',
                     'tls_certfile': 'certfile',
                     'tls_keyfile': 'keyfile'})
            ssl.create_default_context.assert_called_with(cafile='cafile')
            fake_context.load_cert_chain.assert_called_with('certfile',
                                                            'keyfile')