use strict; use warnings;

use lib (-e 't' ? 't' : 'test'), 'inc';

package XXX;

BEGIN {require Thing}

use base 'Thing';

package Foo;

use base 'Spiffy';

BEGIN { @Foo::EXPORT=qw(xxx) }

sub xxx {}

package Bar;

use base 'Foo', 'Thing';

package Boo;

BEGIN { @Boo::EXPORT=qw(xxx) }

sub xxx {}

package Goo;

use base 'Boo';

package Something;

use base 'Spiffy';

BEGIN { @Something::EXPORT = qw(qwerty) }

sub qwerty {}

package SomethingGood;

use base 'Something';

package main;

use Test::More tests => 24;

ok(Thing->isa('Spiffy'));

ok(defined &XXX::thing);

ok(defined &XXX::field);

ok(defined &XXX::const);

ok(defined &Foo::field);

ok(defined &Foo::const);

ok(defined &Foo::xxx);

ok(Bar->isa('Spiffy'));

ok(Bar->isa('Foo'));

ok(Bar->isa('Thing'));

ok(defined &Bar::field);

ok(defined &Bar::const);

ok(defined &Bar::xxx);

ok(defined &Bar::thing);

ok(not Boo->isa('Spiffy'));

ok(defined &Boo::xxx);

ok(not Goo->isa('Spiffy'));

ok(Goo->isa('Boo'));

ok(not defined &Goo::xxx);

ok(SomethingGood->isa('Something'));

ok(SomethingGood->isa('Spiffy'));

ok(not SomethingGood->isa('Thing'));

ok(not defined &SomethingGood::thing);

ok(not @Spiffy::ISA);