assertIsNonePython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。如果输入值等于无assertIsNone()将返回true,否则返回false。
用法: assertIsNone(testValue, message)
参数: assertIsNone()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 DummyClass:
x = 5
class TestMethods(unittest.TestCase):
# test function
def test_negative(self):
firstValue = "geeks"
# error message in case if test case got failed
message = "Test value is not none."
# assertIsNone() to check that if input value is none
self.assertIsNone(firstValue, message)
if __name__ == '__main__':
unittest.main()
输出:
F ====================================================================== FAIL:test_negative (__main__.TestMethods) ---------------------------------------------------------------------- Traceback (most recent call last): File "p1.py", line 14, in test_negative self.assertIsNone(firstValue, message) AssertionError:'geeks' is not None:Test value is not 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 DummyClass:
x = 5
class TestMethods(unittest.TestCase):
# test function
def test_positive(self):
firstValue = None
# error message in case if test case got failed
message = "Test value is not none."
# assertIsNone() to check that if input value is none
self.assertIsNone(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
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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 – assertIsNone() 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。