old_contents: # coding: utf-8
  
  # test cases for validation function: success, failure, sanity
  
  from input_number import parse_numbers, is_valid_number
  from unittest import TestCase
  
  # FZ tried to follow http://www.diveintopython.net/unit_testing/testing_for_success.html
  class InputTests(TestCase):
  
      def input_two_different_on_one_line(self):
          input_num = "A123 B123"
          result = parse_numbers(input_num)
  
          self.assertEqual(["A123", "B123"], result)
  
      def input_three_on_three_lines(self):
  
          input_num = "A123\nB123\nC1223"
          result = parse_numbers(input_num)
  
          self.assertEqual(["A123", "B123", "C123"], result)
  
  
  InputTests.input_three_on_three_lines()
  InputTests.input_two_different_on_one_line()
  
  
new_contents: # coding: utf-8
  
  # test cases for validation function: success, failure, sanity
  
  from input_number import parse_numbers, is_valid_number
  from unittest import TestCase
  
  # FZ tried to follow http://www.diveintopython.net/unit_testing/testing_for_success.html
  class InputTests(TestCase):
  
      def input_two_different_on_one_line(self):
          input_num = "A123 B123"
          result = parse_numbers(input_num)
  
          self.assertEqual(["A123", "B123"], result)
  
      def input_three_on_three_lines(self):
  
          input_num = "A123\nB123\nC1223"
          result = parse_numbers(input_num)
  
          self.assertEqual(["A123", "B123", "C123"], result)
  
  
subject: test stub for input_number