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Python unittest assertLess()用法及代碼示例

Python中的assertLess()是一個單元測試庫函數,用於單元測試中以檢查第一個給定值是否小於第二個值。此函數將使用三個參數作為輸入,並根據斷言條件返回布爾值。

此函數檢查第一個給定值是否小於第二個值,如果是,則返回true;否則,如果第一個值不小於第二個值,則返回false。

用法:assertLess(first, second, message=None) 

參數:assertLess()接受以下三個參數的說明:

  • first:第一個輸入值(整數)
  • second:第二個輸入值(整數)
  • message:作為測試消息失敗時顯示的消息的字符串語句。

下麵列出的示例說明給定的assert函數的正負測試用例:



例子1:如果第一個值不小於第二個值。

Python3

# test suite 
import unittest 
  
class TestStringMethods(unittest.TestCase):
      
    # negative test function to test if 
    # values1 is less than value2 
    def test_negativeForLess(self):
        first = 6
        second = 5
          
        # error message in case if test case got failed 
        message = "first value is not less that second value."
          
        # assert function() to check if values1 is 
        # less than value2 
        self.assertLess(first, second, message) 
  
# main for function call 
if __name__ == '__main__':
    unittest.main()

輸出:

F
======================================================================
FAIL:test_negativeForLess (__main__.TestStringMethods)
———————————————————————-
Traceback (most recent call last):
 File “p1.py”, line 13, in test_negativeForLess
   self.assertLess(first, second, message)
AssertionError:5 not less than 5:first value is not less that second value.

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

FAILED (failures=1)

範例2:如果第一個給定值小於第二個值

Python

# test suite 
import unittest 
  
class TestStringMethods(unittest.TestCase):
      
    # positive test function to test if  
    # values are almost equal with place 
    def test_positiveForLess(self):
        first = 2
        second = 3
          
        # error message in case if test case got failed 
        message = "first value is not less that second value."
          
        # assert function() to check if values1 is 
        # less than value2 
        self.assertLess(first, second, message) 
  
# main for function call 
if __name__ == '__main__':
    unittest.main()

輸出:

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

OK




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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 – assertLess() function in unittest。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。