merging the immutable branch into trunk

[gitmo/Class-MOP.git] / t / 018_anon_class.t

#!/usr/bin/perl

use strict;
use warnings;

use Test::More tests => 24;
use Test::Exception;

BEGIN {
    use_ok('Class::MOP');
}

{
    package Foo;
    use strict;
    use warnings;
    use metaclass;
    
    sub bar { 'Foo::bar' }
}

my $anon_class_id;
my $instance;
{
    my $anon_class = Class::MOP::Class->create_anon_class();
    isa_ok($anon_class, 'Class::MOP::Class');
    
    ($anon_class_id) = ($anon_class->name =~ /Class::MOP::Class::__ANON__::SERIAL::(\d+)/);
    
    ok(exists $main::Class::MOP::Class::__ANON__::SERIAL::{$anon_class_id . '::'}, '... the package exists');
    like($anon_class->name, qr/Class::MOP::Class::__ANON__::SERIAL::[0-9]+/, '... got an anon class package name');

    is_deeply(
        [$anon_class->superclasses],
        [],
        '... got an empty superclass list');
    lives_ok {
        $anon_class->superclasses('Foo');
    } '... can add a superclass to anon class';
    is_deeply(
        [$anon_class->superclasses],
        [ 'Foo' ],
        '... got the right superclass list');

    ok(!$anon_class->has_method('foo'), '... no foo method');
    lives_ok {
        $anon_class->add_method('foo' => sub { "__ANON__::foo" });
    } '... added a method to my anon-class';
    ok($anon_class->has_method('foo'), '... we have a foo method now');  

    $instance = $anon_class->new_object();
    isa_ok($instance, $anon_class->name);  
    isa_ok($instance, 'Foo');    

    is($instance->foo, '__ANON__::foo', '... got the right return value of our foo method');
    is($instance->bar, 'Foo::bar', '... got the right return value of our bar method');    
}

ok(!exists $main::Class::MOP::Class::__ANON__::SERIAL::{$anon_class_id . '::'}, '... the package no longer exists');

# the superclass relationship actually 
# still exists for the instance ...
isa_ok($instance, 'Foo');

# and oddly enough we can still 
# call methods on our instance
can_ok($instance, 'foo');
can_ok($instance, 'bar');

is($instance->foo, '__ANON__::foo', '... got the right return value of our foo method');
is($instance->bar, 'Foo::bar', '... got the right return value of our bar method');

# but it breaks down when we try to create another one ...

my $instance_2 = bless {} => ref($instance);
isa_ok($instance_2, ref($instance));
ok(!$instance_2->isa('Foo'), '... but the new instance is not a Foo');
ok(!$instance_2->can('foo'), '... and it can no longer call the foo method');

# NOTE:
# I bumped this test up to 100_000 instances, and 
# still got not conflicts. If your application needs
# more than that, your probably mst

my %conflicts;
foreach my $i (1 .. 100) {
    $conflicts{ Class::MOP::Class->create_anon_class()->name } = undef;
}
is(scalar(keys %conflicts), 100, '... got as many classes as I would expect');