old_contents: #unit test
  """ doc string"""
  import unittest
  from project2.addition import add
  A = '7'
  B = '5'
  C = '0'
  D = '0'
  class AdditionTestCase(unittest.TestCase):
      """Tests for `addtion.py`"""
      def test_is_valid_input(self):
          """checking for input in codes"""
          self.assertTrue(add(A, B))
      def test_is_valid_input2(self):
          """checking for input in codes"""
          self.assertTrue(add(A, C))
      def test_is_alphabetl(self):
          """testing for alphabets"""
          self.assertFalse(A.islower())
      def test_is_valid_input3(self):
          """testing for normal integers"""
          self.assertFalse(add(C, D))
      def test_is_alphabetu(self):
          """testing for digits"""
          self.assertTrue(A.isdigit())
      def test_is_true(add(A, B)):
          """testing for the sum"""
          add(A, B).assertTrue('12')
  if __name__ == '__main__':
      unittest.main()
  
new_contents: #unit test
  """ doc string"""
  import unittest
  from project2.addition import add
  A = '7'
  B = '5'
  C = '0'
  D = '0'
  class AdditionTestCase(unittest.TestCase):
      """Tests for `addtion.py`"""
      def test_is_valid_input(self):
          """checking for input in codes"""
          self.assertTrue(add(A, B))
      def test_is_valid_input2(self):
          """checking for input in codes"""
          self.assertTrue(add(A, C))
      def test_is_alphabetl(self):
          """testing for alphabets"""
          self.assertFalse(A.islower())
      def test_is_valid_input3(self):
          """testing for normal integers"""
          self.assertFalse(add(C, D))
      def test_is_alphabetu(self):
          """testing for digits"""
          self.assertTrue(A.isdigit())
      def test_is_true(self):
          """testing for the sum"""
          if(add(A, B) == '12'):
              self.assertTrue(add(A, B))
  if __name__ == '__main__':
      unittest.main()
  
subject: Create test_addition.py