def test_task3_MTM() -> None:
# MTM Contracts
contract = MTMContract(datetime.date(2017, 2, 15))
bill = Bill()
contract.new_month(3, 2017, bill)
assert bill.get_cost() == pytest.approx(50.0)
contract.bill_call(gen_call(10))
assert bill.get_cost() == pytest.approx(50.05)
contract.bill_call(gen_call(50))
assert bill.get_cost() == pytest.approx(50.1)
bill = Bill()
contract.new_month(4, 2017, bill)
assert bill.get_cost() == pytest.approx(50.0)
assert contract.cancel_contract() == pytest.approx(50.0)
def test_task3_term() -> None:
contract = TermContract(datetime.date(2017, 1, 1),
datetime.date(2018, 1, 1))
bill = Bill()
contract.new_month(1, 2017, bill)
assert bill.get_cost() == pytest.approx(320)
contract.bill_call(gen_call(20 * 60))
assert bill.get_cost() == pytest.approx(320)
contract.bill_call(gen_call(20 * 60))
assert bill.get_cost() == pytest.approx(320)
contract.bill_call(gen_call(70 * 60))
assert bill.get_cost() == pytest.approx(321)
contract.bill_call(gen_call(100 * 60))
assert bill.get_cost() == pytest.approx(331)
bill = Bill()
contract.new_month(2, 2017, bill)
assert bill.get_cost() == pytest.approx(20)
contract.bill_call(gen_call(150 * 60))
assert bill.get_cost() == pytest.approx(25)
assert contract.cancel_contract() == pytest.approx(25)
contract = TermContract(datetime.date(2017, 1, 1),
datetime.date(2017, 2, 1))
contract.new_month(1, 2017, Bill())
contract.new_month(2, 2017, Bill())
assert contract.cancel_contract() == pytest.approx(-280)