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 0.000sFAILED (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 0.000sOK
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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。