def test_it_returns_both_yesterday_but_no_gaps(self):
links = [date(2019, 4, 28), date(2019, 4, 26), date(2019, 4, 25)]
assert [date(2019, 4, 28)] == links_to_today(links)
def test_it_does_not_return_any_days_if_there_is_a_gap(self):
links = [date(2019, 4, 27)]
assert [] == links_to_today(links)
def test_it_empty_list_for_no_dates(self):
links = []
assert [] == links_to_today(links)
def test_it_returns_both_yesterday_and_day_prior(self):
links = [date(2019, 4, 28), date(2019, 4, 27)]
assert [date(2019, 4, 27), date(2019, 4, 28)] == links_to_today(links)
def test_it_returns_both_today_and_yesterday_if_they_are_only_links_in_chain(self):
links = [date(2019, 4, 29), date(2019, 4, 28)]
assert [date(2019, 4, 28), date(2019, 4, 29)] == links_to_today(links)
def test_it_returns_yesterday_if_yesterday_is_only_link_in_chain(self):
links = [date(2019, 4, 28)]
assert [date(2019, 4, 28)] == links_to_today(links)