testing.py 文件源码

def __call__(self, *args, **kwargs):
        result = self.orig_method(*args, **kwargs)
        if isinstance(result, GeneratorType) or iscoroutine(result):
            raise TypeError("Generator and coroutine test methods should be"
                            " decorated with tornado.testing.gen_test")
        elif result is not None:
            raise ValueError("Return value from test method ignored: %r" %
                             result)