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Python unittest assertLessEqual()用法及代码示例


Python中的assertLessEqual()是单元测试库函数,用于单元测试中以检查第一个给定值是否小于或等于第二个值。此函数将使用三个参数作为输入,并根据断言条件返回布尔值。

此函数检查第一个给定值是否小于或等于第二个值,如果是,则返回true,否则,如果第一个值不小于或等于第二个值,则返回false。

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

参数:assertLessEqual()接受以下三个参数的说明:

  • first:第一个输入值(整数)
  • second:第二个输入值(整数)
  • message:作为测试消息失败时显示的消息的字符串语句。

下面列出的示例说明给定的assert函数的正负测试用例:



范例1:

Python3

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

输出:

F
======================================================================
FAIL:test_negativeForLessEqual (__main__.TestStringMethods)
———————————————————————-
Traceback (most recent call last):
 File “p1.py”, line 13, in test_negativeForLessEqual
   self.assertLessEqual(first, second, message)
AssertionError:6 not less than or equal to 5:first value is not less than or equal to second value.

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

FAILED (failures=1)

范例2:

Python

# test suite 
import unittest 
  
class TestStringMethods(unittest.TestCase):
    
    # positive test function to test if value1 is less or equal than value2 
    def test_positiveForLessEqual(self):
        first = 4
        second = 4
          
        # error message in case if  test case got failed 
        message = "first value is not less than or equal to second value."
          
        # assert function() to check if values1 is less or equal than value2 
        self.assertLessEqual(first, second, message) 
  
  
if __name__ == '__main__':
    unittest.main()

输出:

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

OK




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注:本文由纯净天空筛选整理自Shivam.Pradhan大神的英文原创作品 Python – assertLessEqual() function in unittest。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。