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composite_command.py
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67 lines (51 loc) · 2.01 KB
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import unittest
from command import BankAccount, Command, BankAccountCommand, MoneyTransferCommand
# try using this before using MoneyTransferCommand!
class CompositeBankAccountCommand(Command, list):
def __init__(self, items=[]):
super().__init__()
for i in items:
self.append(i)
def invoke(self):
for x in self:
x.invoke()
def undo(self):
for x in reversed(self):
x.undo()
class TestSuite(unittest.TestCase):
def test_composite_deposit(self):
ba = BankAccount()
deposit1 = BankAccountCommand(ba, BankAccountCommand.Action.DEPOSIT, 1000)
deposit2 = BankAccountCommand(ba, BankAccountCommand.Action.DEPOSIT, 1000)
composite = CompositeBankAccountCommand([deposit1, deposit2])
composite.invoke()
print(ba)
composite.undo()
print(ba)
print("==============================================")
def test_transfer_fail(self):
ba1 = BankAccount(100)
ba2 = BankAccount()
# composite isn't so good because of failure
amount = 1000 # try 1000: no transactions should happen
wc = BankAccountCommand(ba1, BankAccountCommand.Action.WITHDRAW, amount)
dc = BankAccountCommand(ba2, BankAccountCommand.Action.DEPOSIT, amount)
transfer = CompositeBankAccountCommand([wc, dc])
transfer.invoke()
print('ba1:', ba1, 'ba2:', ba2) # end up in incorrect state
transfer.undo()
print('ba1:', ba1, 'ba2:', ba2)
print("==============================================")
def test_better_transfer(self):
ba1 = BankAccount(100)
ba2 = BankAccount()
amount = 1000
transfer = MoneyTransferCommand(ba1, ba2, amount)
transfer.invoke()
print('ba1:', ba1, 'ba2:', ba2)
transfer.undo()
print('ba1:', ba1, 'ba2:', ba2)
print(transfer.success)
print("==============================================")
if __name__ == '__main__':
unittest.main()