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Python unittest assertIsNotNone()用法及代碼示例


assertIsNotNonePython中的()是單元測試庫函數,用於單元測試中以檢查輸入值是否為None。此函數將使用兩個參數作為輸入,並根據斷言條件返回布爾值。如果輸入值不等於無assertIsNotNone()將返回true,否則返回false。

用法: assertIsNotNone(testValue, message)

參數: assertIsNotNone()接受以下列出的兩個參數並作解釋:

  • testValue:將測試變量作為輸入值以檢查是否與None相等
  • message:作為測試消息失敗時顯示的消息的字符串語句。

下麵列出了兩個不同的示例,它們說明了給定assert函數的正麵和負麵測試案例:

示例1:否定測試用例



Python3

# unit test case 
import unittest 
  
class TestMethods(unittest.TestCase):
    # test function  
    def test_negative(self):
        firstValue = None
        # error message in case if test case got failed 
        message = "Test value is none."
        # assertIsNotNone() to check that if input value is not none 
        self.assertIsNotNone(firstValue, message) 
  
if __name__ == '__main__':
    unittest.main()

輸出:

F
======================================================================
FAIL:test_negative (__main__.TestMethods)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "p1.py", line 11, in test_negative
    self.assertIsNotNone(firstValue, message)
AssertionError:unexpectedly None:Test value is none.

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

FAILED (failures=1)


示例2:正測試用例

Python3

# unit test case 
import unittest 
  
class TestMethods(unittest.TestCase):
    # test function  
    def test_positive(self):
        firstValue = "geeks"
        # error message in case if test case got failed 
        message = "Test value is  none."
        # assertIsNotNone() to check that if input value is not none 
        self.assertIsNotNone(firstValue, message) 
  
if __name__ == '__main__':
    unittest.main()

輸出:

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

OK

參考:https://docs.python.org/3/library/unittest.html




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注:本文由純淨天空篩選整理自Shivam.Pradhan大神的英文原創作品 Python unittest – assertIsNotNone() function。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。