def test_repository_returns_date_of_previous_movie(session_factory):
repo = SqlAlchemyRepository(session_factory)
movie = repo.get_movie(6)
previous_date = repo.get_year_of_previous_movie(movie)
assert previous_date == 2016
def test_repository_returns_none_when_there_are_no_previous_movies(
session_factory):
repo = SqlAlchemyRepository(session_factory)
movie = repo.get_movie(1)
previous_date = repo.get_year_of_previous_movie(movie)
assert previous_date is None
