assertIsNonePython中的()是單元測試庫函數,用於單元測試中以檢查輸入值是否為None。此函數將使用兩個參數作為輸入,並根據斷言條件返回布爾值。如果輸入值等於無assertIsNone()將返回true,否則返回false。
用法: assertIsNone(testValue, message)
參數: assertIsNone()接受以下列出的兩個參數並作解釋:
- testValue:將測試變量作為輸入值以檢查是否與None相等
- 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
# unit test case
import unittest
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()
輸出:
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:正測試用例
Python3
# unit test case
import unittest
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()
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 – assertIsNone() 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。