Python unittest – assertFalse() function

Last Updated : 29 Aug, 2020

assertFalse() in Python is a unittest library function that is used in unit testing to compare test value with false. This function will take two parameters as input and return a boolean value depending upon the assert condition. If test value is false then assertFalse() will return true else return false.

Syntax: assertFalse(testValue, message)

Parameters: assertFalse() accepts two parameters which are listed below with explanation:

testValue: variable of a boolean type which is used in the comparison by function

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 TestStringMethods(unittest.TestCase): 
    # test function  
    def test_negative(self): 
        testValue = True
        # error message in case if test case got failed 
        message = "Test value is not false."
        # assetFalse() to check test value as false 
        self.assertFalse( testValue, message) 
  
if __name__ == '__main__': 
    unittest.main()
 
  

Output:

F  ======================================================================  FAIL: test_negative (__main__.TestStringMethods)  ----------------------------------------------------------------------  Traceback (most recent call last):    File "p1.py", line 11, in test_negative      self.assertFalse( testValue, message)  AssertionError: True is not false : Test value is not false.    ----------------------------------------------------------------------  Ran 1 test in 0.000s    FAILED (failures=1)

Example 2: Positive Test case

Python3

   # unit test case 
import unittest 
  
class TestStringMethods(unittest.TestCase): 
    # test function  
    def test_positive(self): 
        testValue = False
        # error message in case if test case got failed 
        message = "Test value is not false."
        # assertFalse() to check test value as false 
        self.assertFalse( testValue, message) 
  
if __name__ == '__main__': 
    unittest.main()
 
  

Output:

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

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

Python unittest - assertTrue() function

Shivam.Pradhan

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Python unittest – assertFalse() function

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