Python unittest assertIn()用法及代码示例

Python中的assertIn()是单元测试库函数，用于单元测试中以检查字符串是否包含在其他字符串中。此函数将使用三个字符串参数作为输入，并根据断言条件返回一个布尔值。如果 key 包含在容器字符串中，它将返回true，否则返回false。

用法： assertIn(key, container, message)

参数：assertIn()接受以下三个参数的说明：

key：在给定容器中检查其存在性的字符串
container：在其中搜索关键字符串的字符串
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

# test suite 
import unittest 
  
class TestStringMethods(unittest.TestCase):
    # test function to test whether key is present in container 
    def test_negative(self):
        key = "gfg"
        container = "geeksforgeeks"
        # error message in case if test case got failed 
        message = "key is not in container."
        # assertIn() to check if key is in container 
        self.assertIn(key, container, message) 
  
if __name__ == '__main__':
    unittest.main()

输出：

F
======================================================================
FAIL:test_negative (__main__.TestStringMethods)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/e920f2cd9195a3fd72bd531f7f101754.py", line 12, in test_negative
    self.assertIn(key, container, message)
AssertionError:'gfg' not found in 'geeksforgeeks':key is not in container.

----------------------------------------------------------------------
Ran 1 test in 0.001s

FAILED (failures=1)

示例2：正测试用例

Python3

# test suite 
import unittest 
  
  
class TestStringMethods(unittest.TestCase):
    # test function to test whether key is present in container 
    def test_positive(self):
        key = "geeks"
        container = "geeksforgeeks"
        # error message in case if test case got failed 
        message = "key is not in container."
        # assertIn() to check if key is in container 
        self.assertIn(key, container, 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 – assertIn() 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。