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|
use strict;
use warnings;
use Test::More tests => 11;
use UNIVERSAL::isa 'isa';
no warnings 'UNIVERSAL::isa';
# class method
{
package Foo;
sub new
{
bless \(my $self), shift;
}
sub isa { 1 }
}
# delegates calls to Foo
{
package Bar;
sub isa
{
return 1 if $_[1] eq 'Foo';
}
}
# really delegates calls to Foo
{
package FooProxy;
sub new
{
my $class = shift;
my $foo = Foo->new( @_ );
bless \$foo, $class;
}
sub can
{
my $self = shift;
return $$self->can( @_ );
}
sub isa
{
my $self = shift;
$$self->can( 'isa' )->( @_ );
}
}
# wraps a Foo object
{
package Quux;
our $AUTOLOAD;
sub isa;
sub new
{
my $class = shift;
my $foo = Foo->new();
bless \$foo, $class;
}
sub can
{
my $self = shift;
return $$self->can( @_ );
}
sub AUTOLOAD
{
my $self = shift;
my ($method) = $AUTOLOAD =~ /::(\w+)$/;
$$self->$method( @_ );
}
sub DESTROY {}
}
my $quux = Quux->new();
ok( isa( 'Bar', 'Foo' ), 'isa() should work on class methods too' );
ok( ! isa( 'Baz', 'Foo' ), '... but not for non-existant classes' );
ok( isa( $quux, 'Foo' ), '... and should work on delegated wrappers' );
is( scalar(isa(undef, 'Foo')), undef, 'isa on undef returns undef');
SKIP: {
eval { +require CGI };
skip( 'CGI not installed; RT #19671', 1 ) if $@;
isa_ok( CGI->new(''), 'CGI' );
}
# overloaded objects
{
package Qibble;
use overload '""' => sub { die };
no warnings 'once';
*new = \&Foo::new;
}
my $qibble = Qibble->new();
ok( isa( $qibble, 'Qibble' ), '... can test ISA on landmines');
my $proxy = FooProxy->new();
isa_ok( $proxy, 'Foo' );
# valid use of isa() as static method on undefined class
TODO: {
my $warnings = '';
local $SIG{__WARN__} = sub { $warnings .= shift };
use warnings 'UNIVERSAL::isa';
# Broken how? -- rjbs, 2012-07-24
local $TODO = 'Apparently broken in 5.6.x' if "$]" < 5.007;
{
local $TODO = "UnloadedClass->isa('UNIVERSAL') fails until 5.17.2"
if "$]" < 5.017002;
ok( UnloadedClass->isa( 'UNIVERSAL' ),
'unloaded class should inherit from UNIVERSAL' );
}
is( $warnings, '', '... and should not warn' );
}
# on an unloaded class
{
my $warnings = '';
local $SIG{__WARN__} = sub { $warnings .= shift };
use warnings 'UNIVERSAL::isa';
UNIVERSAL::isa("Foo", "Bar");
like( $warnings, qr/Called UNIVERSAL::isa/,
'warning on unloaded class given class (RT #24822)' );
UNIVERSAL::isa(bless({}, "Foo"), "Bar");
like( $warnings, qr/Called UNIVERSAL::isa/,
'warning on unloaded class given object (RT #24882)' );
}
|
