运行带有警告作为错误的鼻子测试? [英] Run nosetests with warnings as errors?

问题描述

从命令行运行nosetests时，如何指定将不可忽略"的警告视为错误?

When running nosetests from the command line, how do you specify that 'non-ignored' warnings should be treated as errors?

默认情况下，会打印警告，但不算作失败:

By default, warnings are printed, but not counted as failures:

[snip]/service/accounts/database.py:151: SADeprecationWarning: Use session.add()
  self.session.save(state)
[snip]/service/accounts/database.py:97: SADeprecationWarning: Use session.add()
  self.session.save(user)
............
----------------------------------------------------------------------
Ran 12 tests in 0.085s

OK

由于我们不希望我们的代码生成警告，所以我不希望这种情况出现在OK.

As we don't want our code to generate warnings, I don't want this situation to be OK.

谢谢！

修改: 理想情况下，我想要的是一个鼻子测试命令行选项，该选项在每次测试之前发出warnings.simplefilter('error')(然后将其清除).

Ideally what I'd like is a nosetests command line option that issues a warnings.simplefilter('error') prior to each test (and cleans it out afterwards).

任何涉及在测试代码中使用warnings模块的解决方案似乎都无法解决问题.我不想手动编辑每个测试模块以将警告转换为错误.另外，我不希望每个测试模块的作者都能忘记打开"警告错误.

Any solution that involves using the warnings module in the test code seems to defeat the point. I don't want to manually edit each test module to transform warnings into errors. Plus I don't want the author of each test module to be able to forget to 'turn on' warning errors.

推荐答案

nosetests是一个小的Python脚本.使用编辑器将其打开，并在第一行末尾添加-W error.这告诉Python解释器将警告转换为异常.

nosetests is a small Python script. Open it with an editor, and add -W error at the end of the first line. This tells the Python interpreter to convert warnings into exceptions.

更简单的方法是使用Python环境变量注入将处理警告作为错误"标志:

Even simpler is to use Python environment variable to inject "treat warnings as errors" flag:

PYTHONWARNINGS=error nosetests test/test_*.py --pdb

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