class User:
    'Ein Kunde mit einem Konto.'
    

# Tests

jeff = User(name='Jeff', balance=70, checking_account=True)
joe = User(name='Joe', balance=70, checking_account=False)

jeff.withdraw(2)
assert jeff.balance == 68

joe.check(jeff, 50)
assert joe.balance == 120
assert jeff.balance == 18

try:
    jeff.check(joe, 80)  # raises ValueError
    assert False, "Value Error missing"
except ValueError:
    assert True

joe.checking_account = True # Enables checking for Joe
jeff.check(joe, 80) 
jeff.balance == 98
joe.balance == 40

try:
    joe.check(jeff, 100) # Raises a ValueError
    assert False
except ValueError:
    assert True

jeff.add_cash(20.00)
jeff.balance == 118
print("Alles Tests bestanden")