assertIsNotNonePython中的()是单元测试库函数，用于单元测试中以检查输入值是否为None。此函数将使用两个参数作为输入，并根据断言条件返回布尔值。如果输入值不等于无assertIsNotNone()将返回true，否则返回false。

用法： assertIsNotNone(testValue, message)

参数： assertIsNotNone()接受以下列出的两个参数并作解释：

testValue：将测试变量作为输入值以检查是否与None相等

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 TestMethods(unittest.TestCase):

# test function

def test_negative(self):

firstValue = None

# error message in case if test case got failed

message = "Test value is none."

# assertIsNotNone() to check that if input value is not none

self.assertIsNotNone(firstValue, message)

if __name__ == '__main__':

unittest.main()

输出：

F

======================================================================

FAIL:test_negative (__main__.TestMethods)

----------------------------------------------------------------------

Traceback (most recent call last):

File "p1.py", line 11, in test_negative

self.assertIsNotNone(firstValue, message)

AssertionError:unexpectedly None:Test value is none.

----------------------------------------------------------------------

Ran 1 test in 0.000s

FAILED (failures=1)

示例2：正测试用例

Python3

# unit test case

import unittest

class TestMethods(unittest.TestCase):

# test function

def test_positive(self):

firstValue = "geeks"

# error message in case if test case got failed

message = "Test value is  none."

# assertIsNotNone() to check that if input value is not none

self.assertIsNotNone(firstValue, 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