Python中的assertIsNot()是单元测试库函数,用于单元测试中,以测试第一个和第二个输入值是否不求同一个对象。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。如果两个输入的求值对象都不相同,则assertIsNot()将返回true,否则返回false。
用法: assertIsNot(firstValue, secondValue, message)
参数:assertIsNot()接受以下三个参数的说明:
- firstValue按函数比较中使用的任何类型的变量
- secondValue:按函数比较时使用的任何类型的变量
- message:作为测试消息失败时显示的消息的字符串语句。
下面列出了两个不同的示例,它们说明了给定assert函数的正面和负面测试案例:
示例1:否定测试用例
Python3
# unit test case
import unittest
class DummyClass:
x = 5
class TestMethods(unittest.TestCase):
# test function
def test_negative(self):
firstValue = DummyClass()
secondValue = firstValue
# error message in case if test case got failed
message = "First value & second value evaluates to same object !"
# assertIs() to check that if first & second don't evaluated to same object
self.assertIsNot(firstValue, secondValue, message)
if __name__ == '__main__':
unittest.main()
输出:
F ====================================================================== FAIL:test_negative (__main__.TestMethods) ---------------------------------------------------------------------- Traceback (most recent call last): File "p1.py", line 15, in test_negative self.assertIsNot(firstValue, secondValue, message) AssertionError:unexpectedly identical:<__main__.DummyClass object at 0x7f75c2e33b70> :First value & second value evaluates to same object! ---------------------------------------------------------------------- Ran 1 test in 0.000s FAILED (failures=1)
示例2:正测试用例
Python3
# unit test case
import unittest
class DummyClass:
x = 5
class TestMethods(unittest.TestCase):
# test function to test object equality of two value
def test_positive(self):
firstValue = DummyClass()
secondValue = DummyClass()
# error message in case if test case got failed
message = "First value and second value evaluated to same object !"
# assertIs() to check that if first & second don't evaluates to same object
self.assertIsNot(firstValue, secondValue, message)
if __name__ == '__main__':
unittest.main()
输出:
. ---------------------------------------------------------------------- Ran 1 test in 0.000s OK
参考:https://docs.python.org/3/library/unittest.html
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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 unittest – assertIsNot() function。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。