Unittest

Unit Testing in Python


 Unit Testing is the first level of software testing where the smallest testable parts of a software are tested. 

This is used to validate that each unit of the software performs as designed.

import unittest

  
class SimpleTest(unittest.TestCase):
 
    def test(self):        
        self.assertTrue(True)
  
if __name__ == '__main__':
    unittest.main()

 This is the basic test code using unittest framework, which is having a single test. This test() method will fail if TRUE is ever FALSE.

 

There are three types of possible test outcomes :

  • OK – This means that all the tests are passed.
  • FAIL – This means that the test did not pass and an AssertionError exception is raised.
  • ERROR – This means that the test raises an exception other than AssertionError.

 

 EXAMPLE :

import unittest
  
class TestStringMethods(unittest.TestCase):
      
    def setUp(self):
        pass
  

    def test_strings_a(self):
        self.assertEqual( 'a'*4, 'aaaa')

    def test_upper(self):        
        self.assertEqual('foo'.upper(), 'FOO')

    def test_isupper(self):        
        self.assertTrue('FOO'.isupper())
        self.assertFalse('Foo'.isupper())
 
    def test_strip(self):        
        s = 'geeksforgeeks'
        self.assertEqual(s.strip('geek'), 'sforgeeks')
 
    def test_split(self):        
        s = 'hello world'
        self.assertEqual(s.split(), ['hello', 'world'])
        with self.assertRaises(TypeError):
            s.split(2)
  
if __name__ == '__main__':
    unittest.main()

 

 

Basic terms used in the code :

  • assertEqual() – This statement is used to check if the result obtained is equal to the expected result.
  • assertTrue() / assertFalse() – This statement is used to verify if a given statement is true or false.
  • assertRaises() – This statement is used to raise a specific exception.

 

 

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