Question

我正在开发一个twisted.web服务器 - 它包含一些资源，除了渲染内容之外，还使用adbapi来获取一些数据并将一些数据写入postgresql数据库。我试图弄清楚如何编写一个试验单元测试来测试资源渲染而不使用网络（换句话说：它会初始化资源，产生虚拟请求等）。

让我们假设View资源是一个简单的叶子，在render_GET中返回NOT_DONE_YET和带有adbapi的修饰器以生成简单文本。现在，我已经编写了这个无用的代码，我无法提出如何使它实际初始化资源并产生一些合理的响应：

from twisted.trial import unittest
from myserv.views import View
from twisted.web.test.test_web import DummyRequest

class ExistingView(unittest.TestCase):
    def test_rendering(self):
        slug = "hello_world"
        view = View(slug)
        request = DummyRequest([''])
        output = view.render_GET(request)
        self.assertEqual(request.responseCode, 200)

输出是...... 1.我也尝试过这样的方法：output = request.render（view）但是输出= 1.为什么？我会非常感谢某些示例如何编写这样的单元测试！

Answer 1

这是一个函数，它将呈现一个请求并将结果转换为在渲染完成时触发的Deferred：

def _render(resource, request):
    result = resource.render(request)
    if isinstance(result, str):
        request.write(result)
        request.finish()
        return succeed(None)
    elif result is server.NOT_DONE_YET:
        if request.finished:
            return succeed(None)
        else:
            return request.notifyFinish()
    else:
        raise ValueError("Unexpected return value: %r" % (result,))

它实际上在Twisted Web的测试套件中使用，但它是私有的，因为它本身没有单元测试。 ;）

您可以使用它来编写如下测试：

def test_rendering(self):
    slug = "hello_world"
    view = View(slug)
    request = DummyRequest([''])
    d = _render(view, request)
    def rendered(ignored):
        self.assertEquals(request.responseCode, 200)
        self.assertEquals("".join(request.written), "...")
        ...
    d.addCallback(rendered)
    return d

Answer 2

这是一个DummierRequest类，几乎解决了我所有的问题。唯一剩下的就是它没有设置任何响应代码！为什么呢？

from twisted.web.test.test_web import DummyRequest
from twisted.web import server
from twisted.internet.defer import succeed
from twisted.internet import interfaces, reactor, protocol, address
from twisted.web.http_headers import _DictHeaders, Headers

class DummierRequest(DummyRequest):
    def __init__(self, postpath, session=None):
        DummyRequest.__init__(self, postpath, session)
        self.notifications = []
        self.received_cookies = {}
        self.requestHeaders = Headers()
        self.responseHeaders = Headers()
        self.cookies = [] # outgoing cookies

    def setHost(self, host, port, ssl=0):
        self._forceSSL = ssl
        self.requestHeaders.setRawHeaders("host", [host])
        self.host = address.IPv4Address("TCP", host, port)

    def addCookie(self, k, v, expires=None, domain=None, path=None, max_age=None, comment=None, secure=None):
        """
        Set an outgoing HTTP cookie.

        In general, you should consider using sessions instead of cookies, see
        L{twisted.web.server.Request.getSession} and the
        L{twisted.web.server.Session} class for details.
        """
        cookie = '%s=%s' % (k, v)
        if expires is not None:
            cookie = cookie +"; Expires=%s" % expires
        if domain is not None:
            cookie = cookie +"; Domain=%s" % domain
        if path is not None:
            cookie = cookie +"; Path=%s" % path
        if max_age is not None:
            cookie = cookie +"; Max-Age=%s" % max_age
        if comment is not None:
            cookie = cookie +"; Comment=%s" % comment
        if secure:
            cookie = cookie +"; Secure"
        self.cookies.append(cookie)

    def getCookie(self, key):
        """
        Get a cookie that was sent from the network.
        """
        return self.received_cookies.get(key)

    def getClientIP(self):
        """
        Return the IPv4 address of the client which made this request, if there
        is one, otherwise C{None}.
        """
        return "192.168.1.199"

如何通过试用测试扭曲的网络资源？

2 个答案: