def test_dates_taken_in_past_x_days(self):
prescription = Prescription( \
dispense_date=(date.today() - timedelta(days=2)),
days_supply=4)
self.assertEquals(set([date.today() - timedelta(days=2),
date.today() - timedelta(days=1)]),
prescription.dates_taken_in_past_x_days(2))
