4 use Test::More tests => 19;
19 BankAccount->meta->add_attribute(
21 accessor => 'balance',
22 init_arg => 'balance',
27 sub new { (shift)->meta->new_object(@_) }
30 my ( $self, $amount ) = @_;
31 $self->balance( $self->balance + $amount );
35 my ( $self, $amount ) = @_;
36 my $current_balance = $self->balance();
37 ( $current_balance >= $amount )
38 || confess "Account overdrawn";
39 $self->balance( $current_balance - $amount );
42 package CheckingAccount;
48 use base 'BankAccount';
50 CheckingAccount->meta->add_attribute(
51 'overdraft_account' => (
52 accessor => 'overdraft_account',
53 init_arg => 'overdraft',
57 CheckingAccount->meta->add_before_method_modifier(
59 my ( $self, $amount ) = @_;
60 my $overdraft_amount = $amount - $self->balance();
61 if ( $overdraft_amount > 0 ) {
62 $self->overdraft_account->withdraw($overdraft_amount);
63 $self->deposit($overdraft_amount);
68 ::ok( CheckingAccount->meta->has_method('withdraw'),
69 '... checking account now has a withdraw method' );
70 ::isa_ok( CheckingAccount->meta->get_method('withdraw'),
71 'Class::MOP::Method::Wrapped' );
72 ::isa_ok( BankAccount->meta->get_method('withdraw'),
73 'Class::MOP::Method' );
76 my $savings_account = BankAccount->new( balance => 250 );
77 isa_ok( $savings_account, 'BankAccount' );
79 is( $savings_account->balance, 250, '... got the right savings balance' );
81 $savings_account->withdraw(50);
83 '... withdrew from savings successfully';
84 is( $savings_account->balance, 200,
85 '... got the right savings balance after withdrawl' );
87 $savings_account->withdraw(250);
89 '... could not withdraw from savings successfully';
91 $savings_account->deposit(150);
92 is( $savings_account->balance, 350,
93 '... got the right savings balance after deposit' );
95 my $checking_account = CheckingAccount->new(
97 overdraft => $savings_account
99 isa_ok( $checking_account, 'CheckingAccount' );
100 isa_ok( $checking_account, 'BankAccount' );
102 is( $checking_account->overdraft_account, $savings_account,
103 '... got the right overdraft account' );
105 is( $checking_account->balance, 100, '... got the right checkings balance' );
108 $checking_account->withdraw(50);
110 '... withdrew from checking successfully';
111 is( $checking_account->balance, 50,
112 '... got the right checkings balance after withdrawl' );
113 is( $savings_account->balance, 350,
114 '... got the right savings balance after checking withdrawl (no overdraft)'
118 $checking_account->withdraw(200);
120 '... withdrew from checking successfully';
121 is( $checking_account->balance, 0,
122 '... got the right checkings balance after withdrawl' );
123 is( $savings_account->balance, 200,
124 '... got the right savings balance after overdraft withdrawl' );