old_contents: #!/usr/bin/env python2
  #encoding: UTF-8
  
  import unittest
  import fizzbuzz
  
  class FizzBuzzTest(unittest.TestCase):
      """Testing the fizzbuzz
      """
      def test_returns_fizz_when_divisible_by_three(self):
          """Test return fizz when input is 
          divisible by three
          """
          self.assertEqual(fizzbuzz.fizz_buzz(3), "fizz")
          
      def test_returns_buzz_when_divisible_by_three(self):
          """Test return fizz when input is 
          divisible by three
          """
          self.assertEqual(fizzbuzz.fizz_buzz(5), "buzz")
          
new_contents: #!/usr/bin/env python2
  #encoding: UTF-8
  
  import unittest
  import fizzbuzz
  
  class FizzBuzzTest(unittest.TestCase):
      """Testing the fizzbuzz
      """
      def test_returns_fizz_when_divisible_by_three(self):
          """Test return fizz when input is 
          divisible by three
          """
          self.assertEqual(fizzbuzz.fizz_buzz(3), "fizz")
          
      def test_returns_buzz_when_divisible_by_three(self):
          """Test return fizz when input is 
          divisible by three
          """
          self.assertEqual(fizzbuzz.fizz_buzz(5), "buzz")
          
  if __name__ == '__main__':
      unittest.main()
subject: Add unittest.main