如何使用twisted.web.client.Agent及其子类编写代码测试? [英] How can I write tests for code using twisted.web.client.Agent and its subclasses?

问题描述

我阅读了有关测试驱动开发的官方教程，但是对于我来说，它并不是很有帮助.我已经编写了一个小型库，该库大量使用了twisted.web.client.Agent及其子类(例如，BrowserLikeRedirectAgent)，但是我一直在努力使本教程的代码适应我自己的测试用例.

I read the official tutorial on test-driven development, but it hasn't been very helpful in my case. I've written a small library that makes extensive use of twisted.web.client.Agent and its subclasses (BrowserLikeRedirectAgent, for instance), but I've been struggling in adapting the tutorial's code to my own test cases.

我看过twisted.web.test.test_web，但是我不明白如何使所有部分组合在一起.例如，按照官方教程，我仍然不知道如何从Agent获取Protocol对象

I had a look at twisted.web.test.test_web, but I don't understand how to make all the pieces fit together. For instance, I still have no idea how to get a Protocol object from an Agent, as per the official tutorial

有人可以告诉我如何为依赖于GET和POST数据的代理编写一些简单测试的代码吗?任何其他详细信息或建议，我们都非常欢迎...

Can anybody show me how to write a simple test for some code that relies on Agent to GET and POST data? Any additional details or advice is most welcome...

非常感谢！

推荐答案

如何使用@inlineCallbacks使生活更简单(即代码更具可读性).

How about making life simpler (i.e. code more readable) by using @inlineCallbacks.

实际上，我什至会建议不要直接使用Deferred，除非对性能或特定用例绝对必要，而始终坚持使用@inlineCallbacks-这样，您可以使代码看起来像普通代码，同时受益于非阻塞行为:

In fact, I'd even go as far as to suggest staying away from using Deferreds directly, unless absolutely necessary for performance or in a specific use case, and instead always sticking to @inlineCallbacks—this way you'll keep your code looking like normal code, while benefitting from non-blocking behavior:

from twisted.internet import reactor
from twisted.web.client import Agent
from twisted.internet.defer import inlineCallbacks
from twisted.trial import unittest
from twisted.web.http_headers import Headers
from twisted.internet.error import DNSLookupError


class SomeTestCase(unittest.TestCase):
    @inlineCallbacks
    def test_smth(self):
        ag = Agent(reactor)
        response = yield ag.request('GET', 'http://example.com/', Headers({'User-Agent': ['Twisted Web Client Example']}), None)
        self.assertEquals(response.code, 200)

    @inlineCallbacks
    def test_exception(self):
        ag = Agent(reactor)
        try:
            yield ag.request('GET', 'http://exampleeee.com/', Headers({'User-Agent': ['Twisted Web Client Example']}), None)
        except DNSLookupError:
            pass
        else:
            self.fail()

试用应该照顾其余的问题(即等待测试功能返回的Deferred(@inlineCallbacks包裹的可调用对象也神奇地"返回了Deferred —我强烈建议您阅读有关@inlineCallbacks的更多内容)如果您还不熟悉).

Trial should take care of the rest (i.e. waiting on the Deferreds returned from the test functions (@inlineCallbacks-wrapped callables also "magically" return a Deferred—I strongly suggest reading more on @inlineCallbacks if you're not familiar with it yet).

P.S.还有一个用于鼻子测试的Twisted插件"，使您能够从测试函数中返回Deferred，并鼻子等待直到它们被激发才退出:

P.S. there's also a Twisted "plugin" for nosetests that enables you to return Deferreds from your test functions and have nose wait until they are fired before exiting: http://nose.readthedocs.org/en/latest/api/twistedtools.html

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