Type::Tiny::Duck cmp tests

t/20-unit/Type-Tiny-Duck/cmp.t

@@ -0,0 +1,41 @@
+=pod
+
+=encoding utf-8
+
+=head1 PURPOSE
+
+Test new type comparison stuff with Type::Tiny::Duck objects.
+
+=head1 AUTHOR
+
+Toby Inkster E<lt>tobyink@cpan.orgE<gt>.
+
+=head1 COPYRIGHT AND LICENCE
+
+This software is copyright (c) 2018 by Toby Inkster.
+
+This is free software; you can redistribute it and/or modify it under
+the same terms as the Perl 5 programming language system itself.
+
+=cut
+
+use strict;
+use warnings;
+use lib qw( ./lib ./t/lib ../inc ./inc );
+
+use Test::More;
+use Test::TypeTiny;
+use Type::Utils qw(duck_type);
+
+my $type1 = duck_type Type1 => [qw( foo bar )];
+my $type2 = duck_type Type2 => [qw( bar foo )];
+my $type3 = duck_type Type3 => [qw( foo bar baz )];
+
+ok_subtype($type1 => $type2, $type3);
+ok_subtype($type2 => $type1, $type3);
+ok($type1->equals($type2));
+ok($type2->equals($type1));
+ok($type3->is_subtype_of($type2));
+ok($type2->is_supertype_of($type3));
+
+done_testing;