--- /dev/null
+#!/usr/bin/env perl
+use strict;
+use warnings;
+use Test::More tests => 11;
+use Test::Exception;
+
+my @trigger;
+
+do {
+ package Class;
+ use Mouse;
+
+ has attr => (
+ is => 'rw',
+ default => 10,
+ trigger => sub {
+ my ($self, $value, $attr) = @_;
+ push @trigger, [$self, $value, $attr];
+ },
+ );
+
+ ::lives_ok {
+ has not_error => (
+ is => 'ro',
+ trigger => sub { },
+ );
+ } "it's no longer an error to have trigger on a readonly attribute";
+
+ ::throws_ok {
+ has error => (
+ is => 'ro',
+ trigger => [],
+ );
+ } qr/Trigger must be a CODE ref on attribute \(error\)/;
+};
+
+can_ok(Class => 'attr');
+
+my $object = Class->new;
+is(@trigger, 0, "trigger not called yet");
+
+is($object->attr, 10, "default value");
+is(@trigger, 0, "trigger not called on read");
+
+is($object->attr(50), 50, "setting the value");
+is(@trigger, 1, "trigger was called on read");
+is_deeply([splice @trigger], [[$object, 50, undef]], "correct arguments to trigger in the accessor");
+
+my $object2 = Class->new(attr => 100);
+is(@trigger, 1, "trigger was called on new with the attribute specified");
+is_deeply([splice @trigger], [[$object2, 100, undef]], "correct arguments to trigger in the constructor");
+