input: Write a function to perform unit testing using the unittest framework.
  assert unittest.TestMyClassOrFunction().test_something() is None
output: import unittest
  
  class TestMyClassOrFunction(unittest.TestCase):
      def test_something(self):
          # Example test case
          self.assertEqual(1 + 1, 2)
  
  if __name__ == '__main__':
      unittest.main()