Python 单元测试 - ValueError : no such test method in : runTest

Question

我有一个使用 unittest 的非常简单的设置，但我收到了一个我不明白的错误。

# mytestcase.py
import unittest

class MyTestCase(unittest.TestCase):
    def test_one(self):
        self.assertTrue(True)
    def test_two(self):
        self.assertTrue(False)


def initialize():
    return MyTestCase()

if __name__ == '__main__':
    unittest.main()

如果我执行上面的文件，我会得到以下结果，这是我所期望和理解的:

> python mytestcase.py
.F
======================================================================
FAIL: test_two (__main__.MyTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "mytestcase.py", line 7, in test_two
    self.assertTrue(False)
AssertionError: False is not true

----------------------------------------------------------------------
Ran 2 tests in 0.000s

FAILED (failures=1)

但我想以另一种方式运行这些测试，来自 my_test_manager.py:

# my_test_manager.py
import mytestcase

test_case = mytestcase.initialize()
test_suite = unittest.TestLoader().loadTestsFromTestCase(test_case)
test_suite_result = unittest.TestResult()
test_suite.run(test_suite_result)
for err in test_suite_result.errors:
    print err
for fail in test_suite_result.failures:
    print fail

但是如果我尝试运行这个文件，它会崩溃，如下所示:

> python my_test_manager.py 
Traceback (most recent call last):
  File "my_test_manager.py", line 3, in <module>
    test_case = mytestcase.initialize()
  File "/Users/Jon/dev/test-tools/practice/mytestcase.py", line 11, in initialize
    return MyTestCase()
  File "/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/unittest/case.py", line 191, in __init__
    (self.__class__, methodName))
ValueError: no such test method in <class 'mytestcase.MyTestCase'>: runTest

Answer 1

您不需要创建实例；返回 MyTestCase 类本身:

def initialize():
    return MyTestCase