def test_take_money_when_single_bill_is_added(self):
test_cashdesk = CashDesk()
test_cashdesk.take_money(Bill(10))
expected_result = 1
self.assertEqual(test_cashdesk.number_of_bills(), expected_result)
def test_take_money_when_a_billbatch_is_added(self):
test_cashdesk = CashDesk()
test_cashdesk.take_money(BillBatch([Bill(10), Bill(10), Bill(20)]))
expected_result = 3
self.assertEqual(test_cashdesk.number_of_bills(), expected_result)