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#!/usr/bin/perl
use strict;
use warnings;
no warnings 'redefine';
use Test::More tests => 43;
#use Test::More qw/no_plan/;
local $SIG{__WARN__} = sub {
my $message = shift;
return if $message =~ /Too late to run INIT block/;
warn $message;
};
BEGIN {
chdir 't' if -d 't';
unshift @INC => ( '../lib', 'test_lib' );
}
use Class::Trait;
{
package Foo;
sub new { bless {}, shift }
sub name { 'Foo' }
sub explode { 'Foo explodes' }
}
my $foo = Foo->new;
#
# appling simple runtime traits to instances
#
require TSpouse;
can_ok 'TSpouse', 'apply';
ok +TSpouse->apply($foo),
'... and applying the trait to an instance should succeed';
ok $foo->isa('Foo'), '... and the instance should still respect "isa"';
cmp_ok ref $foo, 'ne', 'Foo', '... but it should be blessed into a new class';
ok $foo->does('TSpouse'), '... and it should be able to do the new trait';
can_ok $foo, 'name';
is $foo->name, 'Foo', '... original methods should still be available';
can_ok $foo, 'explode';
is $foo->explode, 'Spouse explodes',
'... but corresponding trait methods should override them';
can_ok $foo, 'fuse';
is $foo->fuse, 'Spouse fuse',
'... and the new trait methods should be available';
my $foo2 = Foo->new;
is $foo2->explode, 'Foo explodes',
'Different instances of classes should not share runtime traits';
#
# conflicting runtime traits to instances
#
can_ok 'Class::Trait', 'apply';
eval { Class::Trait->apply( $foo2, 'TSpouse', 'TBomb' ) };
ok $@, 'Trying to apply conflicting traits at runtime should fail';
like $@, qr/Package (?:\w|::)+ has conflicting methods \(.*\)/,
'... with an appropriate error message';
undef $foo2; # make sure we don't reuse it
# let's resolve those conflicts
$foo = Foo->new;
Class::Trait->apply(
$foo,
TSpouse => { exclude => 'fuse' },
TBomb => { exclude => 'explode' },
);
ok $foo->does('TSpouse'), '... and it should be able to do the first trait';
ok $foo->does('TBomb'), '... and it should be able to do the second trait';
can_ok $foo, 'name';
is $foo->name, 'Foo', '... original methods should still be available';
can_ok $foo, 'explode';
is $foo->explode, 'Spouse explodes',
'... but corresponding trait methods should override them';
can_ok $foo, 'fuse';
is $foo->fuse, 'Bomb fuse', '... and the new trait methods should be available';
$foo2 = Foo->new;
eval { Class::Trait->apply( $foo2, 'TSpouse' ) };
ok !$@,
'We should be able to apply the conflicting traits to separate instances';
#
# let's apply the traits separately
#
$foo = Foo->new;
Class::Trait->apply( $foo, 'TSpouse' );
ok !$foo->does('TBomb'),
'Trait information should not persist innappropriately';
Class::Trait->apply( $foo, 'TBomb' );
ok $foo->does('TBomb'), '... but we should have that info when it is available';
ok $foo->does('TSpouse'),
'... and it should still report the other traits it can do';
can_ok $foo, 'name';
is $foo->name, 'Foo', '... original methods should still be available';
can_ok $foo, 'explode';
is $foo->explode, 'Bomb explodes',
'... but later trait methods should override earlier ones';
can_ok $foo, 'fuse';
is $foo->fuse, 'Bomb fuse', '... and the new trait methods should be available';
my @does = sort $foo->does;
is_deeply \@does, [qw/TBomb TSpouse/],
'... and it should be able to report all traits it can do';
#
# let's apply runtime composite traits with requirements
#
my $anon_package = ref $foo;
require Extra::TSpouse;
eval { Extra::TSpouse->apply($foo) };
ok $@, 'Trying to apply a runtime trait with unmet requirements should fail';
like $@, qr/Requirement \(alimony\) for Extra::TSpouse not in Foo::/,
'... with an appropriate error message';
ok $foo->isa($anon_package),
'... and the package of the object should not change';
{
no warnings 'once';
*Foo::alimony = sub { 'Foo alimony' };
}
eval { Extra::TSpouse->apply($foo) };
ok $@, 'Trying to apply a runtime trait with unmet requirements should fail';
like $@, qr/Requirement \(lawyer\) for Extra::TSpouse not in Foo::/,
'... with an appropriate error message';
ok $foo->isa($anon_package),
'... and the package of the object should not change';
{
no warnings 'once';
*Foo::lawyer = sub { 'Foo lawyer' };
}
ok +Extra::TSpouse->apply($foo),
'Satisfying all requirements of runtime traits should succeed';
isnt ref $foo, $anon_package,
'... and the instance should have a new anonymous package';
is $foo->explode, 'Extra spouse explodes',
'... and the correct method should be overridden';
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