--- /dev/null
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 11;
+use Test::Exception;
+
+
+
+{
+ package Customer;
+ use Mouse;
+
+ package Firm;
+ use Mouse;
+ use Mouse::Util::TypeConstraints;
+
+ ::lives_ok {
+ has 'customers' => (
+ is => 'ro',
+ isa => subtype('ArrayRef' => where {
+ (blessed($_) && $_->isa('Customer') || return) for @$_; 1 }),
+ auto_deref => 1,
+ );
+ } '... successfully created attr';
+}
+
+{
+ my $customer = Customer->new;
+ isa_ok($customer, 'Customer');
+
+ my $firm = Firm->new(customers => [ $customer ]);
+ isa_ok($firm, 'Firm');
+
+ can_ok($firm, 'customers');
+
+ is_deeply(
+ [ $firm->customers ],
+ [ $customer ],
+ '... got the right dereferenced value'
+ );
+}
+
+{
+ my $firm = Firm->new();
+ isa_ok($firm, 'Firm');
+
+ can_ok($firm, 'customers');
+
+ is_deeply(
+ [ $firm->customers ],
+ [],
+ '... got the right dereferenced value'
+ );
+}
+
+{
+ package AutoDeref;
+ use Mouse;
+
+ has 'bar' => (
+ is => 'rw',
+ isa => 'ArrayRef[Int]',
+ auto_deref => 1,
+ );
+}
+
+{
+ my $autoderef = AutoDeref->new;
+
+ dies_ok {
+ $autoderef->bar(1, 2, 3);
+ } '... its auto-de-ref-ing, not auto-en-ref-ing';
+
+ lives_ok {
+ $autoderef->bar([ 1, 2, 3 ])
+ } '... set the results of bar correctly';
+
+ is_deeply [ $autoderef->bar ], [ 1, 2, 3 ], '... auto-dereffed correctly';
+}