App Engine中的处理程序测试失败：webtest导入错误

Question

我对这个错误完全搞不懂：

======================================================================
ERROR: test_webtest (unittest2.loader.ModuleImportFailure)
----------------------------------------------------------------------
ImportError: Failed to import test module: test_webtest
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/unittest2/loader.py", line 260, in _find_tests
    module = self._get_module_from_name(name)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/unittest2/loader.py", line 238, in _get_module_from_name
    __import__(name)
  File "/Users/chris/Documents/gae/tasker/test/test_webtest.py", line 4, in <module>
    import webtest
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/webtest/__init__.py", line 9, in <module>
    from webtest.app import TestApp
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/webtest/app.py", line 65, in <module>
    class TestRequest(webob.BaseRequest):
AttributeError: 'module' object has no attribute 'BaseRequest'

事情是这样的：

我正在为我的App Engine应用设置处理程序的单元测试。
我在按照这个教程来搭建单元测试框架，包括页面底部的bash脚本，逐字照抄。
我在终端运行测试，使用的命令是：

./run_tests.py /usr/local/google_appengine test/
我在使用这个教程来构建我的处理程序测试。但是它从来没有通过导入这一关。我只需要在test/test_webtest.py里做这个就会出现错误：
```
import webtest
```

我已经安装了webtest：

$ pip install WebTest
Requirement already satisfied (use --upgrade to upgrade): WebTest in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages
Requirement already satisfied (use --upgrade to upgrade): six in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from WebTest)
Requirement already satisfied (use --upgrade to upgrade): WebOb>=1.2 in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from WebTest)
Requirement already satisfied (use --upgrade to upgrade): waitress in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from WebTest)
Requirement already satisfied (use --upgrade to upgrade): beautifulsoup4 in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages (from WebTest)
Requirement already satisfied (use --upgrade to upgrade): distribute in /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/distribute-0.6.28-py2.7.egg (from waitress->WebTest)

我一次性运行所有测试，包括那些没有错误的旧测试。但是在任何一个测试中导入webtest都会产生上面的错误。为什么会这样呢？

单元测试测试框架 bash脚本 app engine 导入错误本地测试 webtest 处理程序测试

App Engine中的处理程序测试失败：webtest导入错误

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