def test_days_due_after_the_due_date(self, mock_now):
mock_now.return_value = date(2015, 6, 1)
lease = BookLeaseFactory()
check = lease.days_due()
self.assertEqual(6, check)
def test_days_due_when_now_is_before_due(self, mock_now):
mock_now.return_value = date(2015, 5, 21)
lease = BookLeaseFactory()
check = lease.days_due()
self.assertEqual(5, check)
