1 files changed, 122 insertions, 0 deletions
diff --git a/t/native_traits/collection_with_roles.t b/t/native_traits/collection_with_roles.t
new file mode 100644
index 0000000..6d75675
--- /dev/null
+++ b/t/native_traits/collection_with_roles.t
@@ -0,0 +1,122 @@
+use strict;
+use warnings;
+
+use Test::More;
+
+{
+    package Subject;
+
+    use Moose::Role;
+
+    has observers => (
+        traits     => ['Array'],
+        is         => 'ro',
+        isa        => 'ArrayRef[Observer]',
+        auto_deref => 1,
+        default    => sub { [] },
+        handles    => {
+            'add_observer'    => 'push',
+            'count_observers' => 'count',
+        },
+    );
+
+    sub notify {
+        my ($self) = @_;
+        foreach my $observer ( $self->observers() ) {
+            $observer->update($self);
+        }
+    }
+}
+
+{
+    package Observer;
+
+    use Moose::Role;
+
+    requires 'update';
+}
+
+{
+    package Counter;
+
+    use Moose;
+
+    with 'Subject';
+
+    has count => (
+        traits  => ['Counter'],
+        is      => 'ro',
+        isa     => 'Int',
+        default => 0,
+        handles => {
+            inc_counter => 'inc',
+            dec_counter => 'dec',
+        },
+    );
+
+    after qw(inc_counter dec_counter) => sub {
+        my ($self) = @_;
+        $self->notify();
+    };
+}
+
+{
+
+    package Display;
+
+    use Test::More;
+
+    use Moose;
+
+    with 'Observer';
+
+    sub update {
+        my ( $self, $subject ) = @_;
+        like $subject->count, qr{^-?\d+$},
+            'Observed number ' . $subject->count;
+    }
+}
+
+package main;
+
+my $count = Counter->new();
+
+ok( $count->can('add_observer'), 'add_observer method added' );
+
+ok( $count->can('count_observers'), 'count_observers method added' );
+
+ok( $count->can('inc_counter'), 'inc_counter method added' );
+
+ok( $count->can('dec_counter'), 'dec_counter method added' );
+
+$count->add_observer( Display->new() );
+
+is( $count->count_observers, 1, 'Only one observer' );
+
+is( $count->count, 0, 'Default to zero' );
+
+$count->inc_counter;
+
+is( $count->count, 1, 'Increment to one ' );
+
+$count->inc_counter for ( 1 .. 6 );
+
+is( $count->count, 7, 'Increment up to seven' );
+
+$count->dec_counter;
+
+is( $count->count, 6, 'Decrement to 6' );
+
+$count->dec_counter for ( 1 .. 5 );
+
+is( $count->count, 1, 'Decrement to 1' );
+
+$count->dec_counter for ( 1 .. 2 );
+
+is( $count->count, -1, 'Negative numbers' );
+
+$count->inc_counter;
+
+is( $count->count, 0, 'Back to zero' );
+
+done_testing;