--- /dev/null
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 18;
+use Test::Exception;
+
+BEGIN {
+ use_ok('Mouse::Util::TypeConstraints');
+}
+
+{
+ package Gorch;
+ use Mouse::Role;
+
+ package Bar;
+ use Mouse::Role;
+
+ package Foo;
+ use Mouse::Role;
+
+ with qw(Bar Gorch);
+
+ package FooC;
+ use Mouse;
+ with qw(Foo);
+
+ package BarC;
+ use Mouse;
+ with qw(Bar);
+
+}
+
+lives_ok { role_type('Boop', message { "${_} is not a Boop" }) }
+ 'role_type keywork works with message';
+
+my $type = find_type_constraint("Foo");
+
+is( $type->role, "Foo", "role attribute" );
+
+ok( $type->is_subtype_of("Gorch"), "subtype of gorch" );
+
+ok( $type->is_subtype_of("Bar"), "subtype of bar" );
+
+ok( $type->is_subtype_of("Object"), "subtype of Object" );
+
+ok( !$type->is_subtype_of("ThisTypeDoesNotExist"), "not subtype of unknown type name" );
+ok( !$type->is_a_type_of("ThisTypeDoesNotExist"), "not type of unknown type name" );
+
+ok( find_type_constraint("Bar")->check(FooC->new), "Foo passes Bar" );
+ok( find_type_constraint("Bar")->check(BarC->new), "Bar passes Bar" );
+ok( !find_type_constraint("Gorch")->check(BarC->new), "but Bar doesn't pass Gorch");
+
+my $boop = find_type_constraint("Boop");
+ok( $boop->has_message, 'Boop has a message');
+my $error = $boop->get_message(FooC->new);
+like( $error, qr/is not a Boop/, 'boop gives correct error message');
+
+
+ok( $type->equals($type), "equals self" );
+ok( $type->equals(Mouse::Meta::TypeConstraint::Role->new( name => "__ANON__", role => "Foo" )), "equals anon constraint of same value" );
+ok( $type->equals(Mouse::Meta::TypeConstraint::Role->new( name => "Oink", role => "Foo" )), "equals differently named constraint of same value" );
+ok( !$type->equals(Mouse::Meta::TypeConstraint::Role->new( name => "__ANON__", role => "Bar" )), "doesn't equal other anon constraint" );
+ok( $type->is_subtype_of(Mouse::Meta::TypeConstraint::Role->new( name => "__ANON__", role => "Bar" )), "subtype of other anon constraint" );
+