Python – 单元测试中的 assertLessEqual()函数
Python中的assertLessEqual()是一个unittest库函数，用于单元测试以检查第一个给定值是否小于或等于第二个值。该函数将采用三个参数作为输入，并根据断言条件返回一个布尔值。
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。
Syntax: assertLessEqual(first, second, message=None)
Parameters: assertLessEqual() accept three parameters which are listed below with explanation:
- first: first input value (integer)
- second: second input value (integer)
- message: a string sentence as a message which got displayed when the test case got failed.
下面列出了一个示例，说明了给定断言函数的正面和负面测试用例：
示例 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()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：
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)
示例 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