def test_repository_returns_none_when_there_are_no_subsequent_articles(session_factory):
repo = SqlAlchemyRepository(session_factory)
article = repo.get_article(177)
next_date = repo.get_date_of_next_article(article)
assert next_date is None
def test_repository_returns_date_of_next_article(session_factory):
repo = SqlAlchemyRepository(session_factory)
article = repo.get_article(3)
next_date = repo.get_date_of_next_article(article)
assert next_date.isoformat() == '2020-03-05'
