testing_test.py 文件源码

def test_timeout(self):
        # Set a short timeout and exceed it.
        @gen_test(timeout=0.1)
        def test(self):
            yield gen.Task(self.io_loop.add_timeout, self.io_loop.time() + 1)

        # This can't use assertRaises because we need to inspect the
        # exc_info triple (and not just the exception object)
        try:
            test(self)
            self.fail("did not get expected exception")
        except ioloop.TimeoutError:
            # The stack trace should blame the add_timeout line, not just
            # unrelated IOLoop/testing internals.
            self.assertIn(
                "gen.Task(self.io_loop.add_timeout, self.io_loop.time() + 1)",
                traceback.format_exc())

        self.finished = True