def setUp(self): en = Language(pk='en') self.john = Author(first_name="John", last_name="Lennon") self.john.save() self.song1 = Song(title="Give Peace a Chance", composed_year=1971, language=en) self.song1.save() self.song1.composed_by.add(self.john) self.john.songs_composed.create(title="Imagine", composed_year=1971, language=en)