def test_header_items(self): response = Response() response.delete_cookie('test_cookie') response.headers['Location'] = '/' self.assertEqual(response.headers_items().sort(), [ ('Content-Type', 'text/html; charset=utf8'), ('Location', '/'), ('Set-Cookie', ' test_cookie=; expires=Thu, 01-Jan-1970 00:00:00 GMT; Max-Age=0; Path=/') ].sort())