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