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diff --git a/t/040_type_constraints/016_subtyping_parameterized_types.t b/t/040_type_constraints/016_subtyping_parameterized_types.t
new file mode 100644
index 0000000..8bd6d9b
--- /dev/null
+++ b/t/040_type_constraints/016_subtyping_parameterized_types.t
@@ -0,0 +1,136 @@
+#!/usr/bin/perl
+# This is automatically generated by author/import-moose-test.pl.
+# DO NOT EDIT THIS FILE. ANY CHANGES WILL BE LOST!!!
+use t::lib::MooseCompat;
+
+use strict;
+use warnings;
+
+use Test::More;
+use Test::Exception;
+
+BEGIN {
+    use_ok("Mouse::Util::TypeConstraints");
+}
+
+lives_ok {
+    subtype 'MySpecialHash' => as 'HashRef[Int]';
+} '... created the subtype special okay';
+
+{
+    my $t = find_type_constraint('MySpecialHash');
+    isa_ok($t, 'Mouse::Meta::TypeConstraint');
+
+    is($t->name, 'MySpecialHash', '... name is correct');
+
+    my $p = $t->parent;
+    isa_ok($p, 'Mouse::Meta::TypeConstraint');
+    isa_ok($p, 'Mouse::Meta::TypeConstraint');
+
+    is($p->name, 'HashRef[Int]', '... parent name is correct');
+
+    ok($t->check({ one => 1, two => 2 }), '... validated {one=>1, two=>2} correctly');
+    ok(!$t->check({ one => "ONE", two => "TWO" }), '... validated it correctly');
+
+    #ok( $t->equals($t), "equals to self" );
+    #ok( !$t->equals( $t->parent ), "not equal to parent" );
+    #ok( $t->parent->equals( $t->parent ), "parent equals to self" );
+
+    ok( !$t->is_a_type_of("ThisTypeDoesNotExist"), "not a non existant type" );
+    ok( !$t->is_subtype_of("ThisTypeDoesNotExist"), "not a subtype of a non existant type" );
+}
+
+lives_ok {
+    subtype 'MySpecialHashExtended'
+        => as 'HashRef[Int]'
+        => where {
+            # all values are less then 10
+            (scalar grep { $_ < 10 } values %{$_}) ? 1 : undef
+        };
+} '... created the subtype special okay';
+
+{
+    my $t = find_type_constraint('MySpecialHashExtended');
+    isa_ok($t, 'Mouse::Meta::TypeConstraint');
+
+    is($t->name, 'MySpecialHashExtended', '... name is correct');
+
+    my $p = $t->parent;
+    isa_ok($p, 'Mouse::Meta::TypeConstraint');
+    isa_ok($p, 'Mouse::Meta::TypeConstraint');
+
+    is($p->name, 'HashRef[Int]', '... parent name is correct');
+
+    ok($t->check({ one => 1, two => 2 }), '... validated it correctly');
+    ok(!$t->check({ zero => 10, one => 11, two => 12 }), '... validated { zero => 10, one => 11, two => 12 } correctly') or diag $t->dump;
+    ok(!$t->check({ one => "ONE", two => "TWO" }), '... validated it correctly');
+}
+
+lives_ok {
+    subtype 'MyNonSpecialHash'
+        => as "HashRef"
+        => where { keys %$_ == 3 };
+};
+
+{
+    my $t = find_type_constraint('MyNonSpecialHash');
+
+    isa_ok($t, 'Mouse::Meta::TypeConstraint');
+    isa_ok($t, 'Mouse::Meta::TypeConstraint');
+
+    ok( $t->check({ one => 1, two => "foo", three => [] }), "validated" );
+    ok( !$t->check({ one => 1 }), "failed" );
+}
+
+{
+    my $t = Mouse::Util::TypeConstraints::find_or_parse_type_constraint('MyNonSpecialHash[Int]');
+
+    isa_ok($t, 'Mouse::Meta::TypeConstraint');
+
+    ok( $t->check({ one => 1, two => 2, three => 3 }), "validated" );
+    ok( !$t->check({ one => 1, two => "foo", three => [] }), "failed" )
+        or diag $t->dump;
+    ok( !$t->check({ one => 1 }), "failed" );
+}
+
+{
+    ## Because to throw errors in M:M:Parameterizable needs Mouse loaded in
+    ## order to throw errors.  In theory the use Mouse belongs to that class
+    ## but when I put it there causes all sorts or trouble.  In theory this is
+    ## never a real problem since you are likely to use Mouse somewhere when you
+    ## are creating type constraints.
+    use Mouse ();
+
+    my $MyArrayRefInt =  subtype 'MyArrayRefInt',
+        as 'ArrayRef[Int]';
+
+    my $BiggerInt = subtype 'BiggerInt',
+        as 'Int',
+        where {$_>10};
+
+    my $SubOfMyArrayRef = subtype 'SubOfMyArrayRef',
+        as 'MyArrayRefInt[BiggerInt]';
+
+    ok $MyArrayRefInt->check([1,2,3]), '[1,2,3] is okay';
+    ok ! $MyArrayRefInt->check(["a","b"]), '["a","b"] is not';
+    ok $BiggerInt->check(100), '100 is  big enough';
+    ok ! $BiggerInt->check(5), '5 is  big enough';
+    ok $SubOfMyArrayRef->check([15,20,25]), '[15,20,25] is a bunch of big ints';
+    ok ! $SubOfMyArrayRef->check([15,5,25]), '[15,5,25] is NOT a bunch of big ints';
+
+    throws_ok sub {
+        my $SubOfMyArrayRef = subtype 'SubSubOfMyArrayRef',
+            as 'SubOfMyArrayRef[Str]';
+    }, qr/Str is not a subtype of BiggerInt/, 'Failed to parameterize with a bad type parameter';
+}
+
+{
+    last; # ScalarRef[] is not supported
+    my $RefToInt = subtype as 'ScalarRef[Int]';
+
+    ok $RefToInt->check(\1), '\1 is okay';
+    ok !$RefToInt->check(1), '1 is not';
+    ok !$RefToInt->check(\"foo"), '\"foo" is not';
+}
+
+done_testing;