Python unittest assertIn()用法及代碼示例

Python中的assertIn()是單元測試庫函數，用於單元測試中以檢查字符串是否包含在其他字符串中。此函數將使用三個字符串參數作為輸入，並根據斷言條件返回一個布爾值。如果 key 包含在容器字符串中，它將返回true，否則返回false。

用法： assertIn(key, container, message)

參數：assertIn()接受以下三個參數的說明：

key：在給定容器中檢查其存在性的字符串
container：在其中搜索關鍵字符串的字符串
message：作為測試消息失敗時顯示的消息的字符串語句。

下麵列出了兩個不同的示例，它們說明了給定assert函數的正麵和負麵測試案例：

示例1：否定測試用例

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()

輸出：

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：正測試用例

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()

輸出：

.
----------------------------------------------------------------------
Ran 1 test in 0.000s

OK

參考：https：//docs.python.org/3/library/unittest.html

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注：本文由純淨天空篩選整理自Shivam.Pradhan大神的英文原創作品 Python unittest – assertIn() function。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。