Question

我正在学习python unitesting并想测试异常处理。为什么assertRaises没有被抓住而我的unittest失败了？

def abc(xyz):
    print xyz
    try:
        raise RuntimeError('I going to raise exception')
    except ValueError, e:
        print e
    except RuntimeError, e:
        print e
    except Exception, e:
        print e


import unittest

class SimplisticTest(unittest.TestCase):
    def test_1(self):
        with self.assertRaises(RuntimeError):
            abc(2)

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



2
F
I going to raise exception
======================================================================
FAIL: test_1 (__main__.SimplisticTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/d066537/ClionProjects/pythonspark/sample.py", line 18, in test_1
    abc(2)
AssertionError: RuntimeError not raised

----------------------------------------------------------------------
Ran 1 test in 0.000s

FAILED (failures=1)

为什么测试失败以及如何纠正它。问题是这个问题：

def abc(xyz):
    print xyz
    raise ValueError('I going to raise exception')




import unittest

class SimplisticTest(unittest.TestCase):
    def test_1(self):
        self.assertRaises(ValueError, abc(2), msg="Exception not getting caught")

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

2
E
======================================================================
ERROR: test_1 (__main__.SimplisticTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/d066537/ClionProjects/pythonspark/sample.py", line 12, in test_1
    self.assertRaises(ValueError, abc(2), msg="Exception not getting caught")
  File "/home/d066537/ClionProjects/pythonspark/sample.py", line 3, in abc
    raise ValueError('I going to raise exception')
ValueError: I going to raise exception

----------------------------------------------------------------------
Ran 1 test in 0.000s

FAILED (errors=1)

Answer 1

因为它没有提高它;函数内部捕获并处理异常。

在第二个示例中，您调用函数并将结果传递给assertRaises，因此异常发生在assertRaises可以捕获它之前。您应该像在第一个示例中那样使用上下文管理器方法，或者传递callable：git diff <HASH>。

assertRaises没有得到匹配

1 个答案: