在 Python unittest 框架中,是否有办法在未引发异常的情况下通过单元测试,否则通过 AssertRaise 失败?
In the Python unittest framework, is there a way to pass a unit test if an exception wasn't raised, and fail with an AssertRaise otherwise?
推荐答案如果我正确理解你的问题,你可以做这样的事情:
If I understand your question correctly, you could do something like this:
def test_does_not_raise_on_valid_input(self): raised = False try: do_something(42) except: raised = True self.assertFalse(raised, 'Exception raised')...假设您有相应的测试,可以在无效输入上引发正确的Exception,当然:
...assuming that you have a corresponding test that the correct Exception gets raised on invalid input, of course:
def test_does_raise_on_invalid_input(self): self.assertRaises(OutOfCheese, do_something, 43)然而,正如评论中所指出的,您需要考虑您实际测试的是什么.很可能像这样的测试...
However, as pointed out in the comments, you need to consider what it is that you are actually testing. It's likely that a test like...
def test_what_is_42(self): self.assertEquals(do_something(42), 'Meaning of life')...更好,因为它测试系统所需的行为,如果出现异常就会失败.
...is better because it tests the desired behaviour of the system and will fail if an exception is raised.
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如果未引发异常,则通过 Python 单元测试
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