--- /dev/null
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 24;
+use Test::Exception;
+
+BEGIN {
+ use_ok('Mouse::Util::TypeConstraints');
+ use_ok('Mouse::Meta::TypeConstraint::Parameterized');
+}
+
+# Array of Ints
+
+my $array_of_ints = Mouse::Meta::TypeConstraint::Parameterized->new(
+ name => 'ArrayRef[Int]',
+ parent => find_type_constraint('ArrayRef'),
+ type_parameter => find_type_constraint('Int'),
+);
+isa_ok($array_of_ints, 'Mouse::Meta::TypeConstraint::Parameterized');
+isa_ok($array_of_ints, 'Mouse::Meta::TypeConstraint');
+
+ok($array_of_ints->check([ 1, 2, 3, 4 ]), '... [ 1, 2, 3, 4 ] passed successfully');
+ok(!$array_of_ints->check([qw/foo bar baz/]), '... [qw/foo bar baz/] failed successfully');
+ok(!$array_of_ints->check([ 1, 2, 3, qw/foo bar/]), '... [ 1, 2, 3, qw/foo bar/] failed successfully');
+
+ok(!$array_of_ints->check(1), '... 1 failed successfully');
+ok(!$array_of_ints->check({}), '... {} failed successfully');
+ok(!$array_of_ints->check(sub { () }), '... sub { () } failed successfully');
+
+# Hash of Ints
+
+my $hash_of_ints = Mouse::Meta::TypeConstraint::Parameterized->new(
+ name => 'HashRef[Int]',
+ parent => find_type_constraint('HashRef'),
+ type_parameter => find_type_constraint('Int'),
+);
+isa_ok($hash_of_ints, 'Mouse::Meta::TypeConstraint::Parameterized');
+isa_ok($hash_of_ints, 'Mouse::Meta::TypeConstraint');
+
+ok($hash_of_ints->check({ one => 1, two => 2, three => 3 }), '... { one => 1, two => 2, three => 3 } passed successfully');
+ok(!$hash_of_ints->check({ 1 => 'one', 2 => 'two', 3 => 'three' }), '... { 1 => one, 2 => two, 3 => three } failed successfully');
+ok(!$hash_of_ints->check({ 1 => 'one', 2 => 'two', three => 3 }), '... { 1 => one, 2 => two, three => 3 } failed successfully');
+
+ok(!$hash_of_ints->check(1), '... 1 failed successfully');
+ok(!$hash_of_ints->check([]), '... [] failed successfully');
+ok(!$hash_of_ints->check(sub { () }), '... sub { () } failed successfully');
+
+# Array of Array of Ints
+
+my $array_of_array_of_ints = Mouse::Meta::TypeConstraint::Parameterized->new(
+ name => 'ArrayRef[ArrayRef[Int]]',
+ parent => find_type_constraint('ArrayRef'),
+ type_parameter => $array_of_ints,
+);
+isa_ok($array_of_array_of_ints, 'Mouse::Meta::TypeConstraint::Parameterized');
+isa_ok($array_of_array_of_ints, 'Mouse::Meta::TypeConstraint');
+
+ok($array_of_array_of_ints->check(
+ [[ 1, 2, 3 ], [ 4, 5, 6 ]]
+), '... [[ 1, 2, 3 ], [ 4, 5, 6 ]] passed successfully');
+ok(!$array_of_array_of_ints->check(
+ [[ 1, 2, 3 ], [ qw/foo bar/ ]]
+), '... [[ 1, 2, 3 ], [ qw/foo bar/ ]] failed successfully');
+
+{
+ my $anon_type = Mouse::Util::TypeConstraints::find_or_parse_type_constraint('ArrayRef[Foo]');
+ isa_ok( $anon_type, 'Mouse::Meta::TypeConstraint::Parameterized' );
+
+ my $param_type = $anon_type->type_parameter;
+ isa_ok( $param_type, 'Mouse::Meta::TypeConstraint::Class' );
+}