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Python unittest - assertIsNone() function

Last Updated : 29 Aug, 2020
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assertIsNone() in Python is a unittest library function that is used in unit testing to check that input value is None or not. This function will take two parameters as input and return a boolean value depending upon assert condition. If input value is equal to None assertIsNone() will return true else return false.

Syntax: assertIsNone(testValue, message)

Parameters: assertIsNone() accept two parameters which are listed below with explanation:

  • testValue:  test variable as the input value to check equality with None
  • message: a string sentence as a message which got displayed when the test case got failed.

Listed below are two different examples illustrating the positive and negative test case for given assert function:

Example 1: Negative Test case

Output:

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)


Example 2: Positive Test case

Output:

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

OK


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


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