old_contents: #!/usr/bin/env python
  
  
  class Person:
      def __init__(self, first_name, last_name):
          self.first_name = first_name
          self.last_name = last_name
  
      def fullname(self):
          return "%s %s" % (self.first_name, self.last_name)
  
      def not_called(self):
          print("Shouldn't be called")
  
  person = Person("Marty", "McFly")
  person.fullname()
  
new_contents: ﻿#!/usr/bin/env python
  
  
  class Person:
      def __init__(self, first_name, last_name):
          self.first_name = first_name
          self.last_name = last_name
  
      def fullname(self):
          return "%s %s" % (self.first_name, self.last_name)
  
      def not_called(self):
          print("Shouldn't be called")
  
  person = Person("Marty", "McFly")
  person.fullname()
  
subject: Add BOM signature to test fixture