1 files changed, 224 insertions, 0 deletions
diff --git a/t/metaclasses/metaclass_traits.t b/t/metaclasses/metaclass_traits.t
new file mode 100644
index 0000000..bcb9f90
--- /dev/null
+++ b/t/metaclasses/metaclass_traits.t
@@ -0,0 +1,224 @@
+use strict;
+use warnings;
+
+use lib 't/lib';
+
+use Test::More;
+use Test::Fatal;
+
+{
+    package My::SimpleTrait;
+
+    use Moose::Role;
+
+    sub simple { return 5 }
+}
+
+{
+    package Foo;
+
+    use Moose -traits => [ 'My::SimpleTrait' ];
+}
+
+can_ok( Foo->meta(), 'simple' );
+is( Foo->meta()->simple(), 5,
+    'Foo->meta()->simple() returns expected value' );
+
+{
+    package Bar;
+
+    use Moose -traits => 'My::SimpleTrait';
+}
+
+can_ok( Bar->meta(), 'simple' );
+is( Bar->meta()->simple(), 5,
+    'Foo->meta()->simple() returns expected value' );
+
+{
+    package My::SimpleTrait2;
+
+    use Moose::Role;
+
+    # This needs to happen at compile time so it happens before we
+    # apply traits to Bar
+    BEGIN {
+        has 'attr' =>
+            ( is      => 'ro',
+              default => 'something',
+            );
+    }
+
+    sub simple { return 5 }
+}
+
+{
+    package Bar;
+
+    use Moose -traits => [ 'My::SimpleTrait2' ];
+}
+
+can_ok( Bar->meta(), 'simple' );
+is( Bar->meta()->simple(), 5,
+    'Bar->meta()->simple() returns expected value' );
+can_ok( Bar->meta(), 'attr' );
+is( Bar->meta()->attr(), 'something',
+    'Bar->meta()->attr() returns expected value' );
+
+{
+    package My::SimpleTrait3;
+
+    use Moose::Role;
+
+    BEGIN {
+        has 'attr2' =>
+            ( is      => 'ro',
+              default => 'something',
+            );
+    }
+
+    sub simple2 { return 55 }
+}
+
+{
+    package Baz;
+
+    use Moose -traits => [ 'My::SimpleTrait2', 'My::SimpleTrait3' ];
+}
+
+can_ok( Baz->meta(), 'simple' );
+is( Baz->meta()->simple(), 5,
+    'Baz->meta()->simple() returns expected value' );
+can_ok( Baz->meta(), 'attr' );
+is( Baz->meta()->attr(), 'something',
+    'Baz->meta()->attr() returns expected value' );
+can_ok( Baz->meta(), 'simple2' );
+is( Baz->meta()->simple2(), 55,
+    'Baz->meta()->simple2() returns expected value' );
+can_ok( Baz->meta(), 'attr2' );
+is( Baz->meta()->attr2(), 'something',
+    'Baz->meta()->attr2() returns expected value' );
+
+{
+    package My::Trait::AlwaysRO;
+
+    use Moose::Role;
+
+    around '_process_new_attribute', '_process_inherited_attribute' =>
+        sub {
+            my $orig = shift;
+            my ( $self, $name, %args ) = @_;
+
+            $args{is} = 'ro';
+
+            return $self->$orig( $name, %args );
+        };
+}
+
+{
+    package Quux;
+
+    use Moose -traits => [ 'My::Trait::AlwaysRO' ];
+
+    has 'size' =>
+        ( is  => 'rw',
+          isa => 'Int',
+        );
+}
+
+ok( Quux->meta()->has_attribute('size'),
+    'Quux has size attribute' );
+ok( ! Quux->meta()->get_attribute('size')->writer(),
+    'size attribute does not have a writer' );
+
+{
+    package My::Class::Whatever;
+
+    use Moose::Role;
+
+    sub whatever { 42 }
+
+    package Moose::Meta::Class::Custom::Trait::Whatever;
+
+    sub register_implementation {
+        return 'My::Class::Whatever';
+    }
+}
+
+{
+    package RanOutOfNames;
+
+    use Moose -traits => [ 'Whatever' ];
+}
+
+ok( RanOutOfNames->meta()->meta()->has_method('whatever'),
+    'RanOutOfNames->meta() has whatever method' );
+
+{
+    package Role::Foo;
+
+    use Moose::Role -traits => [ 'My::SimpleTrait' ];
+}
+
+can_ok( Role::Foo->meta(), 'simple' );
+is( Role::Foo->meta()->simple(), 5,
+    'Role::Foo->meta()->simple() returns expected value' );
+
+{
+    require Moose::Util::TypeConstraints;
+    like(
+        exception {
+            Moose::Util::TypeConstraints->import(
+                -traits => 'My::SimpleTrait' );
+        },
+        qr/does not have an init_meta/,
+        'cannot provide -traits to an exporting module that does not init_meta'
+    );
+}
+
+{
+    package Foo::Subclass;
+
+    use Moose -traits => [ 'My::SimpleTrait3' ];
+
+    extends 'Foo';
+}
+
+can_ok( Foo::Subclass->meta(), 'simple' );
+is( Foo::Subclass->meta()->simple(), 5,
+    'Foo::Subclass->meta()->simple() returns expected value' );
+is( Foo::Subclass->meta()->simple2(), 55,
+    'Foo::Subclass->meta()->simple2() returns expected value' );
+can_ok( Foo::Subclass->meta(), 'attr2' );
+is( Foo::Subclass->meta()->attr2(), 'something',
+    'Foo::Subclass->meta()->attr2() returns expected value' );
+
+{
+
+    package Class::WithAlreadyPresentTrait;
+    use Moose -traits => 'My::SimpleTrait';
+
+    has an_attr => ( is => 'ro' );
+}
+
+is( exception {
+    my $instance = Class::WithAlreadyPresentTrait->new( an_attr => 'value' );
+    is( $instance->an_attr, 'value', 'Can get value' );
+}, undef, 'Can create instance and access attributes' );
+
+{
+
+    package Class::WhichLoadsATraitFromDisk;
+
+    # Any role you like here, the only important bit is that it gets
+    # loaded from disk and has not already been defined.
+    use Moose -traits => 'Role::Parent';
+
+    has an_attr => ( is => 'ro' );
+}
+
+is( exception {
+    my $instance = Class::WhichLoadsATraitFromDisk->new( an_attr => 'value' );
+    is( $instance->an_attr, 'value', 'Can get value' );
+}, undef, 'Can create instance and access attributes' );
+
+done_testing;