nothingmuch's take on delegation (no attr proxying yet)

[gitmo/Moose.git] / t / 070_delegation.t

#!/usr/bin/perl

use strict;
use warnings;

use Test::More tests => 34;
use Test::Exception;

{

    package ChildASuper;
    use Moose;

    sub child_a_super_method { "as" }

    package ChildA;
    use Moose;

    extends "ChildASuper";

    sub child_a_method_1 { "a1" }
    sub child_a_method_2 { Scalar::Util::blessed($_[0]) . " a2" }

    package ChildASub;
    use Moose;

    extends "ChildA";

    sub child_a_method_3 { "a3" }

    package ChildB;
    use Moose;

    sub child_b_method_1 { "b1" }
    sub child_b_method_2 { "b2" }
    sub child_b_method_3 { "b3" }

    package ChildC;
    use Moose;

    sub child_c_method_1 { "c1" }
    sub child_c_method_2 { "c2" }
    sub child_c_method_3_la { "c3" }
    sub child_c_method_4_la { "c4" }

    package ChildD;
    use Moose;

    sub child_d_method_1 { "d1" }
    sub child_d_method_2 { "d2" }

    package ChildE;
    # no Moose

    sub new { bless {}, shift }
    sub child_e_method_1 { "e1" }
    sub child_e_method_2 { "e2" }

    package ChildF;
    # no Moose

    sub new { bless {}, shift }
    sub child_f_method_1 { "f1" }
    sub child_f_method_2 { "f2" }

    package Parent;
    use Moose;

    ::dies_ok {
        has child_a => (
            is      => "ro",
            default => sub { ChildA->new },
            handles => all_methods,
        );
    } "all_methods requires explicit isa";

    ::lives_ok {
        has child_a => (
            isa     => "ChildA",
            is      => "ro",
            default => sub { ChildA->new },
            handles => all_methods,
        );
    } "allow all_methods with explicit isa";

    ::lives_ok {
        has child_b => (
            default => sub { ChildB->new },
            handles => [qw/child_b_method_1/],
        );
    } "don't need to declare isa if method list is predefined";

    ::lives_ok {
        has child_c => (
            isa     => "ChildC",
            is      => "ro",
            default => sub { ChildC->new },
            handles => qr/_la$/,
        );
    } "can declare regex collector";

    ::dies_ok {
        has child_d => (
            is      => "ro",
            default => sub { ChildD->new },
            handles => sub {
                my ( $class, $delegate_class ) = @_;
            }
        );
    } "can't create attr with generative handles parameter and no isa";

    ::lives_ok {
        has child_d => (
            isa     => "ChildD",
            is      => "ro",
            default => sub { ChildD->new },
            handles => sub {
                my ( $class, $delegate_class ) = @_;
                return;
            }
        );
    } "can't create attr with generative handles parameter and no isa";

    ::lives_ok {
        has child_e => (
            isa     => "ChildE",
            is      => "ro",
            default => sub { ChildE->new },
            handles => "child_e_method_2",
        );
    } "can delegate to non moose class using explicit method list";

    ::dies_ok {
        has child_f => (
            isa     => "ChildF",
            is      => "ro",
            default => sub { ChildF->new },
            handles => sub { },
        );
    } "but not generative one";

    sub parent_method { "p" }
}

# sanity

isa_ok( my $p = Parent->new, "Parent" );
isa_ok( $p->child_a, "ChildA" );
#isa_ok( $p->child_b, "ChildB" ); # no accessor
isa_ok( $p->child_c, "ChildC" );
isa_ok( $p->child_d, "ChildD" );
isa_ok( $p->child_e, "ChildE" );

ok( !$p->can("child_b"), "no child b accessor" );
ok( !$p->can("child_f"), "no child f" );

is( $p->parent_method, "p", "parent method" );
is( $p->child_a->child_a_super_method, "as", "child supermethod" );
is( $p->child_a->child_a_method_1, "a1", "child method" );

can_ok( $p, "child_a_super_method" );
can_ok( $p, "child_a_method_1" );
can_ok( $p, "child_a_method_2" );
ok( !$p->can( "child_a_method_3" ), "but not subclass of delegate class" );

is( $p->child_a_method_1, $p->child_a->child_a_method_1, "delegate behaves the same" );
is( $p->child_a_method_2, "ChildA a2", "delegates are their own invocants" );


can_ok( $p, "child_b_method_1" );
ok( !$p->can("child_b_method_2"), "but not ChildB's unspecified siblings" );


ok( !$p->can($_), "none of ChildD's methods ($_)" )
    for grep { /^child/ } map { $_->{name} } ChildD->meta->compute_all_applicable_methods();

can_ok( $p, "child_c_method_3_la" );
can_ok( $p, "child_c_method_4_la" );

is( $p->child_c_method_3_la, "c3", "ChildC method delegated OK" );

can_ok( $p, "child_e_method_2" );
ok( !$p->can("child_e_method_1"), "but not child_e_method_1");

is( $p->child_e_method_2, "e2", "delegate to non moose class (child_e_method_2)" );