old_contents: #unit test
  """ doc string"""
  import unittest
  from project2.addition import add
  
  class AdditionTestCase(unittest.TestCase):
      """Tests for `addtion.py`"""
  
      def test_is_valid_input(self):
          """checking for input in codes"""
          self.assertTrue(add('4', '5'))
      def test_is_alphabetl(self):
          """testing for alphabets"""
          self.assertFalse('A'.islower())
      def test_is_valid_input2(self):
          """testing for normal integers"""
          self.assertTrue(add(4, 5))
      def test_is_alphabetu(self):
          """testing for alphabets"""
          self.assertFalse('A'.isupper())
  if __name__ == '__main__':
      unittest.main()
  
new_contents: #unit test
  """ doc string"""
  import unittest
  from project2.addition import add
  
  class AdditionTestCase(unittest.TestCase):
      """Tests for `addtion.py`"""
  
      def test_is_valid_input(self):
          """checking for input in codes"""
          self.assertTrue(add('4', '5'))
      def test_is_alphabetl(self):
          """testing for alphabets"""
          self.assertFalse('A'.islower())
      def test_is_valid_input2(self):
          """testing for normal integers"""
          self.assertTrue(add(0, 0))
      def test_is_alphabetu(self):
          """testing for alphabets"""
          self.assertFalse(A.isupper())
  if __name__ == '__main__':
      unittest.main()
  
subject: Create test_addition.py