def test_repository_returns_none_when_there_are_no_previous_movies(session_factory):
repo = SqlAlchemyRepository(session_factory)
movie = repo.get_movie_by_index(2)
previous_year = repo.get_release_year_of_previous_movie(movie)
assert previous_year is None
def test_repository_returns_release_year_of_previous_movie(session_factory):
repo = SqlAlchemyRepository(session_factory)
movie = repo.get_movie_by_index(1)
previous_year = repo.get_release_year_of_previous_movie(movie)
assert previous_year == 2012 # 2013 for 1000 movies
