Python 2.6:正确使用 unittest.TestSuite [英] Python 2.6: proper usage of unittest.TestSuite

问题描述

使用 Python 2.6，我在一个目录中的 python 文件中进行了一个非常简单的测试:

Using Python 2.6, I have a very simple test in a python file in a directory:

#mytest.py
import unittest

class BasicTests(unittest.TestCase):
    def test_ok(self):
        self.assertTrue(True)

suite = unittest.TestLoader().loadTestsFromTestCase(BasicTests)

我切换到目录并运行 python -m unittest mytest.suite 并且我收到以下错误:

I change into the directory and run python -m unittest mytest.suite and I get the following error:

Traceback (most recent call last):
  File "/usr/lib/python2.6/runpy.py", line 122, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.6/runpy.py", line 34, in _run_code
    exec code in run_globals
  File "/usr/lib/python2.6/unittest.py", line 875, in <module>
    main(module=None)
  File "/usr/lib/python2.6/unittest.py", line 816, in __init__
    self.parseArgs(argv)
  File "/usr/lib/python2.6/unittest.py", line 843, in parseArgs
    self.createTests()
  File "/usr/lib/python2.6/unittest.py", line 849, in createTests
    self.module)
  File "/usr/lib/python2.6/unittest.py", line 613, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
  File "/usr/lib/python2.6/unittest.py", line 598, in loadTestsFromName
    test = obj()
  File "/usr/lib/python2.6/unittest.py", line 464, in __call__
    return self.run(*args, **kwds)
TypeError: run() takes exactly 2 arguments (1 given)

我尝试了几种变体(例如 unittest.makeSuite 和 unittest.LoadTestFromNames)，但它们都给我相同的基本错误.我错过了什么?我一直阅读文档，我似乎正在关注规格

I've tried several variations (such as unittest.makeSuite and unittest.LoadTestFromNames) but they all give me the same basic error. What am I missing? I keep reading the documentation and I seem to be following the spec.

推荐答案

我通常不会在命令行上使用 unittest，但有自己的测试运行脚本.

I don't usually work with unittest on the command line, but have my own test running scripts.

你需要在模块中添加一个函数suite

You need to add a function suite to the module

def suite():
    return unittest.TestLoader().loadTestsFromTestCase(BasicTests)

然后像python -m unittest mytest.suite一样调用它.但后来我遇到了以下问题:

and then call it like python -m unittest mytest.suite. But then I run into the following problem:

TypeError: calling <function suite at 0x00C1FB70> returned <unittest.TestSuite tests=[<mysite.BasicTests testMethod=test_ok>]>, not a test

发生这种情况是因为 unittest 使用了类似 isinstance(mytest.suite(), TestSuite) 但通过使用 -m 执行，你得到TestSuite 类的两个不同版本(一个是 __main__.TestSuite，另一个是 unittest.TestSuite)，所以 isinstance 返回假.
对我来说，这看起来像是一个错误.通过在loadTestsFromName 的开头插入from unittest import TestSuite, TestCase 来修补unittest.py 解决了isinstance 问题.抱歉，我无法为您提供正确"解决方案(如果有).

which happens because unittest uses something like isinstance(mytest.suite(), TestSuite) but through executing with -m, you get two different versions of the TestSuite class (one is __main__.TestSuite, the other is unittest.TestSuite), so isinstance returns false.
To me, this looks like a bug. Patching unittest.py by inserting from unittest import TestSuite, TestCase at the beginning of loadTestsFromName solves the isinstance problem. Sorry I can't give you the "correct" solution (if there is one).

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