Python Selenium WebDriver 示例错误：'f.QueryInterface 不是一个函数

Question

我想为我的Django应用写一些Selenium的单元测试。我们已经有很多普通的Python单元测试了。我从Django文档中复制了一个示例Selenium测试（这就像是Selenium的“你好，世界”）:

from selenium.webdriver.firefox.webdriver import WebDriver
from django.test import LiveServerTestCase


class MySeleniumTestCase(LiveServerTestCase):
    @classmethod
    def setUpClass(cls):
        cls.selenium = WebDriver()
        super(MySeleniumTestCase, cls).setUpClass()

    @classmethod
    def tearDownClass(cls):
        cls.selenium.quit()
        super(MySeleniumTestCase, cls).tearDownClass()

    def test_simple(self):
        self.selenium.get("/")

但是，当我在本地运行这个测试，或者使用CircleCI（云端测试服务）时，我遇到了这个错误:

======================================================================
ERROR: test_simple (proj.lib.tests.MySeleniumTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/ubuntu//proj/proj/lib/tests.py", line 1347, in test_simple
    self.selenium.get("/")
  File "/home/ubuntu/proj/venv/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 185, in get
    self.execute(Command.GET, {'url': url})
  File "/home/ubuntu/proj/venv/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 173, in execute
    self.error_handler.check_response(response)
  File "/home/ubuntu/proj/venv/lib/python2.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 164, in check_response
    raise exception_class(message, screen, stacktrace)
WebDriverException: Message: u'f.QueryInterface is not a function' ; Stacktrace: 
    at FirefoxDriver.prototype.get (file:///tmp/tmpXXrLF6/extensions/fxdriver@googlecode.com/components/driver_component.js:9333)
    at DelayedCommand.prototype.executeInternal_/h (file:///tmp/tmpXXrLF6/extensions/fxdriver@googlecode.com/components/command_processor.js:11455)
    at DelayedCommand.prototype.executeInternal_ (file:///tmp/tmpXXrLF6/extensions/fxdriver@googlecode.com/components/command_processor.js:11460)
    at DelayedCommand.prototype.execute/< (file:///tmp/tmpXXrLF6/extensions/fxdriver@googlecode.com/components/command_processor.js:11402)

我使用的是Django 1.5.5，Python 2.7，Selenium的Python包版本是2.42.1。

这是什么问题呢？我该如何让Selenium正常工作？

Answer 1

get 方法需要一个完整的网址。也就是说，必须包含协议（比如http或https）和主机名或IP地址。

self.selenium.get("/")
# becomes
self.selenium.get("http://stackoverflow.com/questions/24011019/")