我在 Python 中运行单元测试时遇到了这个奇怪的问题: 我使用了assertRaises,并且运行单元测试引发了正确的异常,但测试仍然失败。好吧,我无法真正解释它,请自行查看回溯:
Error
Traceback (most recent call last):
File "/Users/chianti/PycharmProjects/Programming_Project/Part1and4/Part1and4Test.py", line 32, in test_non_alpha_name
self.assertRaises(RestNameContainNonAlphaError, RestaurantName(self.non_alpha_name))
File "/Users/chianti/PycharmProjects/Programming_Project/Part1and4/InputCheck.py", line 29, in __init__
raise RestNameContainNonAlphaError('There are non alphabetic characters that I can not recognize!')
RestNameContainNonAlphaError: There are non alphabetic characters that I can not recognize!
Error
Traceback (most recent call last):
File "/Users/chianti/PycharmProjects/Programming_Project/Part1and4/Part1and4Test.py", line 24, in test_non_string_name
self.assertRaises(InputNotStringError, RestaurantName, self.non_string_name)
File "/Users/chianti/anaconda/lib/python2.7/unittest/case.py", line 473, in assertRaises
callableObj(*args, **kwargs)
File "/Users/chianti/PycharmProjects/Programming_Project/Part1and4/InputCheck.py", line 33, in __init__
raise InputNotStringError('Not String! The input is supposed to be a string type!')
InputNotStringError: Not String! The input is supposed to be a string type!
为什么??????????任何想法表示赞赏!谢谢您
<小时/>这是我的单元测试:
class RestaurantNameTests(unittest.TestCase):
def setUp(self):
self.non_string_name = 123
self.valid_name = 'Italian rest '
self.non_alpha_name = 'valid ** n'
def tearDown(self):
self.non_string_name = None
self.valid_name = None
self.non_alpha_name = None
def test_non_string_name(self):
with self.assertRaises(InputNotStringError):
RestaurantName(self.non_string_name)
def test_valid_name(self):
self.assertEqual(RestaurantName(self.valid_name).__str__(), 'Italian rest')
def test_non_alpha_name(self):
self.assertRaises(RestNameContainNonAlphaError, RestaurantName(self.non_alpha_name))
如果您需要查看 RestaurantName 的定义,这里是:
class RestaurantName():
def __init__(self, input_contents):
self.name = input_contents
if IsValidString(self.name):
self.no_space_name = self.name.replace(' ', '')
if str.isalpha(self.no_space_name):
pass
else:
raise RestNameContainNonAlphaError('There are non alphabetic characters that I can not recognize!')
else:
raise InputNotStringError('Not String! The input is supposed to be a string type!')
def __repr__(self):
return 'RestaurantName(%s)' % self.name.strip()
def __str__(self):
return self.name.strip()
再次感谢
最佳答案
回溯与您对问题的描述(也不符合您的代码 FWIW)不匹配。您收到的错误位于 test_non_alpha_name()
中,您没有发布该错误,但从错误消息来看,它看起来像:
self.assertRaises(
RestNameContainNonAlphaError,
RestaurantName(self.non_alpha_name)
)
这不是使用 assertRaises()
的正确方法。您必须将 ExpectedExceptionClass, callable, *args, **kw
传递给 assertRaises
,并且 args
和 kw
将是传递给你的可调用对象。 IOW你想要:
self.assertRaises(
RestNameContainNonAlphaError,
RestaurantName,
self.non_alpha_name
)
原因很简单:按照您当前的调用方式,异常是在调用 assertRaises
之前触发的。
附注:
- 你的tearDown方法没用
- 已经有一个针对错误类型的内置异常,名为
TypeError
- 还有一个针对错误值的内置异常,名为
ValueError
关于Python单元测试断言引发错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27299542/