old_contents: import nose.tools
  from source import referee_highchair
  
  def test_referee_is_an_object():
      referee = Referee()
      assert isinstance(referee, object) == True
  
new_contents: import nose.tools
  from source.referee_highchair import *
  
  def test_referee_is_an_object():
      referee = Referee()
      assert isinstance(referee, object) == True
  
subject: rewrite test to import proper source file