Python unittest – assertIsNotNone() function
assertIsNotNone() in Python is a unittest library function that is used in unit testing to check that input value is not None. This function will take two parameters as input and return a boolean value depending upon assert condition. If input value is not equal to None assertIsNotNone() will return true else return false.
Syntax: assertIsNotNone(testValue, message)
Parameters: assertIsNotNone() 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
Python3
# unit test case import unittest class TestMethods(unittest.TestCase): # test function def test_negative( self ): firstValue = None # error message in case if test case got failed message = "Test value is none." # assertIsNotNone() to check that if input value is not none self .assertIsNotNone(firstValue, message) if __name__ = = '__main__' : unittest.main() |
Output:
F ====================================================================== FAIL: test_negative (__main__.TestMethods) ---------------------------------------------------------------------- Traceback (most recent call last): File "p1.py", line 11, in test_negative self.assertIsNotNone(firstValue, message) AssertionError: unexpectedly None : Test value is none. ---------------------------------------------------------------------- Ran 1 test in 0.000s FAILED (failures=1)
Example 2: Positive Test case
Python3
# unit test case import unittest class TestMethods(unittest.TestCase): # test function def test_positive( self ): firstValue = "Beginner" # error message in case if test case got failed message = "Test value is none." # assertIsNotNone() to check that if input value is not none self .assertIsNotNone(firstValue, message) if __name__ = = '__main__' : unittest.main() |
Output:
. ---------------------------------------------------------------------- Ran 1 test in 0.000s OK
Reference: https://docs.python.org/3/library/unittest.html
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