Python中的assertEqual()是单元测试库函数，用于单元测试中以检查两个值的相等性。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。如果两个输入值相等，则assertEqual()将返回true，否则返回false。
用法： assertEqual(firstValue, secondValue, message)
参数：assertEqual()接受以下说明的三个参数：
firstValue按功能比较中使用的任何类型的变量
secondValue：按功能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 TestStringMethods():
# test function to test equality of two value
def test_negative(self):
firstValue = "geeks"
secondValue = "gfg"
# error message in case if test case got failed
message = "First value and second value are not equal !"
# assertEqual() to check equality of first & second value
(firstValue, secondValue, message)
if __name__ == '__main__':
()
输出：
F
======================================================================
FAIL:test_negative (__main__.TestStringMethods)
----------------------------------------------------------------------
Traceback (most recent call last):
File "", line 12, in test_negative
(firstValue, secondValue, message)
AssertionError:'geeks' != 'gfg'
- geeks
+ gfg
:First value and second value are not equal!
----------------------------------------------------------------------
Ran 1 test in 0.000s
FAILED (failures=1)
示例2：正测试用例
Python3
# unit test case
import unittest
class TestStringMethods():
# 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 equal !"
# assertEqual() to check equality of first & second value
(firstValue, secondValue, message)
if __name__ == '__main__':
()
输出：
.
----------------------------------------------------------------------
Ran 1 test in 0.000s
OK
参考：https：///3/library/