带有phantomjs的Django LiveServerTestCase间歇性挂起/超时

Question

我正在使用Django（1.5.5），硒（2.41.0），碎片（0.6.0）和phantomjs（1.9.7）进行实时测试。

尽管测试大部分都能正常进行，但有时（在CircleCI上经常出现，而在本地VM中很少出现）它们会挂起，直到CircleCI超时或我手动杀死运行程序为止（Ctrl-C，即KeyboardInterrupt起作用）。

这是我的基本测试类的外观：

class SplinterTestCase(LiveServerTestCase):
    @classmethod
    def setUpClass(cls):
        super(SplinterTestCase, cls).setUpClass()
        # start phantom just once per class, to speed up tests
        cls.phantom = splinter.Browser('phantomjs', load_images=False)

    @classmethod
    def tearDownClass(cls):
        cls.phantom.quit()
        super(SplinterTestCase, cls).tearDownClass()

    def login(self, *args, **kwargs):
        # perform a login using Django builtin "client", steal the session
        # cookie and inject it to phantomjs, avoiding the need to do the
        # login dance for each test
        from django.conf import settings
        cn = settings.SESSION_COOKIE_NAME

        self.django_client.login(*args, **kwargs)
        if cn in self.django_client.cookies:
            self.client.driver.add_cookie({
                'name': cn,
                'value': self.django_client.cookies[cn].value,
                'path': '/',
                'domain': 'localhost'
            })

    def setUp(self):
        # use phantom as the test client instead of Django's
        super(SplinterTestCase, self).setUp()
        self.django_client = self.client
        self.client = self.phantom

    def tearDown(self):
        # this seems to help somewhat (decreases the number of timeouts), but
        # doesn't solve it completely
        self.client.visit('about:config')
        super(SplinterTestCase, self).tearDown()

在Ctrl-C之后，这是我得到的stacktrace：

Traceback (most recent call last):
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 86, in run
    self.finish_response()
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 127, in finish_response
    self.write(data)
  File "/usr/lib/python2.7/wsgiref/handlers.py", line 215, in write
    self._write(data)
  File "/usr/lib/python2.7/socket.py", line 324, in write
    self.flush()
  File "/usr/lib/python2.7/socket.py", line 303, in flush
    self._sock.sendall(view[write_offset:write_offset+buffer_size])
error: [Errno 104] Connection reset by peer
Traceback (most recent call last):
  File "/home/ubuntu/memo-angel/venv/local/lib/python2.7/site-packages/django/test/testcases.py", line 998, in _handle_request_noblock
    self.process_request(request, client_address)
  File "/usr/lib/python2.7/SocketServer.py", line 310, in process_request
    self.finish_request(request, client_address)
  File "/usr/lib/python2.7/SocketServer.py", line 323, in finish_request
    self.RequestHandlerClass(request, client_address, self)
  File "/home/ubuntu/memo-angel/venv/local/lib/python2.7/site-packages/django/core/servers/basehttp.py", line 150, in __init__
    super(WSGIRequestHandler, self).__init__(*args, **kwargs)
  File "/usr/lib/python2.7/SocketServer.py", line 640, in __init__
    self.finish()
  File "/usr/lib/python2.7/SocketServer.py", line 693, in finish
    self.wfile.flush()
  File "/usr/lib/python2.7/socket.py", line 303, in flush
    self._sock.sendall(view[write_offset:write_offset+buffer_size])
error: [Errno 32] Broken pipe

在Django中可能已经用splinter讨论了类似的问题，而phantomjs却非常缓慢，因为原始海报还提到“它冻结了，直到我没有耐心等待它完成”。 那里提到的答案试图将phantomjs启动/停止放在类设置/拆卸中，这是我在这里所做的，但是并不能解决问题。

有没有人遇到过类似的问题，如果有，您的解决方法是什么？

Answer 1

为了确定问题并使测试更快失败，您可能需要在setUpClass / setUp中配置套接字超时：

import socket

...
socket.setdefaulttimeout(10)