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diff --git a/t/040_type_constraints/failing/020_class_type_constraint.t b/t/040_type_constraints/failing/020_class_type_constraint.t
new file mode 100644
index 0000000..05a9320
--- /dev/null
+++ b/t/040_type_constraints/failing/020_class_type_constraint.t
@@ -0,0 +1,60 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 20;
+use Test::Exception;
+
+BEGIN {
+    use_ok('Mouse::Util::TypeConstraints');
+}
+
+{
+    package Gorch;
+    use Mouse;
+
+    package Bar;
+    use Mouse;
+
+    package Foo;
+    use Mouse;
+
+    extends qw(Bar Gorch);
+
+}
+
+lives_ok { class_type 'Beep' } 'class_type keywork works';
+lives_ok { class_type('Boop', message { "${_} is not a Boop" }) }
+  'class_type keywork works with message';
+
+my $type = find_type_constraint("Foo");
+
+is( $type->class, "Foo", "class 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 undefined type" );
+ok( !$type->is_a_type_of("ThisTypeDoesNotExist"), "not type of undefined type" );
+
+ok( find_type_constraint("Bar")->check(Foo->new), "Foo passes Bar" );
+ok( find_type_constraint("Bar")->check(Bar->new), "Bar passes Bar" );
+ok( !find_type_constraint("Gorch")->check(Bar->new), "but Bar doesn't pass Gorch");
+
+ok( find_type_constraint("Beep")->check( bless {} => 'Beep' ), "Beep passes Beep" );
+my $boop = find_type_constraint("Boop");
+ok( $boop->has_message, 'Boop has a message');
+my $error = $boop->get_message(Foo->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::Class->new( name => "__ANON__", class => "Foo" )), "equals anon constraint of same value" );
+ok( $type->equals(Mouse::Meta::TypeConstraint::Class->new( name => "Oink", class => "Foo" )), "equals differently named constraint of same value" );
+ok( !$type->equals(Mouse::Meta::TypeConstraint::Class->new( name => "__ANON__", class => "Bar" )), "doesn't equal other anon constraint" );
+ok( $type->is_subtype_of(Mouse::Meta::TypeConstraint::Class->new( name => "__ANON__", class => "Bar" )), "subtype of other anon constraint" );
+