Python單元測試聲明錯誤

Question

我有這個奇怪的麻煩在Python運行我的unittest： 我用assertRaises，並運行unittest引發正確的異常，但測試仍然失敗。好吧，我真的不能解釋它，請看看自己的回溯：

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! 

爲什麼??????????任何想法都很感謝！ THANK YOU

---

這裏是我的單元測試：

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)) 

如果你需要看RestaurantName的定義，那就是：

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() 

再次感謝

Answer 1

回溯與您對問題的描述不符（也不符合您的代碼FWIW）。你得到的錯誤是在test_non_alpha_name()你沒有張貼但是從你的錯誤信息是這樣：

self.assertRaises(
    RestNameContainNonAlphaError, 
    RestaurantName(self.non_alpha_name) 
    ) 

這是不使用assertRaises()的正確方法。您必須通過ExpectedExceptionClass, callable, *args, **kw到assertRaises，args和kw將傳遞給您的可調用。督察你想：

self.assertRaises(
    RestNameContainNonAlphaError, 
    RestaurantName, 
    self.non_alpha_name 
    ) 

原因很簡單：你現在把它的方式，在異常觸發之前調用assertRaises。

補充說明：

• 您的拆卸方法是沒用的
• 已經有一個爲錯誤類型的一個內置的例外，它的命名TypeError
• 有也是錯誤的價值觀一個內建的異常被命名爲ValueError