Python unittest – assertNotEqual()函数
Python中的 assertNotEqual() 是一个 unittest 库函数,用于在单元测试中检查两个值的不等性。该函数将三个参数作为输入,并根据断言条件返回一个布尔值。如果两个输入值不相等,assertNotEqual() 将返回 true,否则返回 false。
句法:
assertNotEqual(firstValue, secondValue, message)
参数: assertNotEqual() 接受下面列出的三个参数,并附有说明:
- firstValue:函数比较中使用的任何类型的变量
- secondValue:函数比较中使用的任何类型的变量
- message:一个字符串语句,作为测试用例失败时显示的消息。
下面列出了两个不同的示例,说明了给定断言函数的正负测试用例:
示例 1:否定测试用例
Python3
# unit test case
import unittest
class TestStringMethods(unittest.TestCase):
# test function to test equality of two value
def test_negative(self):
firstValue = "geeks"
secondValue = "geeksg"
# error message in case if test case got failed
message = "First value and second value are not unequal !"
# assertNotEqual() to check unequality of first & second value
self.assertNotEqual(firstValue, secondValue, message)
if __name__ == '__main__':
unittest.main()
Python3
# unit test case
import unittest
class TestStringMethods(unittest.TestCase):
# test function to test equality of two value
def test_positive(self):
firstValue = "geeks"
secondValue = "geeks"
# error message in case if test case got failed
message = "First value and second value are not unequal !"
# assertNotEqual() to check equality of first & second value
self.assertNotEqual(firstValue, secondValue, message)
if __name__ == '__main__':
unittest.main()
输出:
F
======================================================================
FAIL: test_negative (__main__.TestStringMethods)
----------------------------------------------------------------------
Traceback (most recent call last):
File "p1.py", line 12, in test_negative
self.assertNotEqual(firstValue, secondValue, message)
AssertionError: 'geeks' == 'geeks' : First value and second value are not unequal!
----------------------------------------------------------------------
Ran 1 test in 0.000s
FAILED (failures=1)
示例 2:正面测试用例
Python3
# unit test case
import unittest
class TestStringMethods(unittest.TestCase):
# test function to test equality of two value
def test_positive(self):
firstValue = "geeks"
secondValue = "geeks"
# error message in case if test case got failed
message = "First value and second value are not unequal !"
# assertNotEqual() to check equality of first & second value
self.assertNotEqual(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