add the registry test

t/registry.t

@@ -0,0 +1,23 @@
+use Test2::V0;
+
+use Dancer2::Plugin::JsonApi::Registry;
+
+use experimental qw/ signatures /;
+
+my $registry = Dancer2::Plugin::JsonApi::Registry->new;
+
+$registry->add_type(
+    people => {
+    id => 'id',
+    links => {
+        self => sub($data) {
+            return "/peoples/$data->{id}"
+        }
+    }
+    }
+);
+
+isa_ok $registry->type('people') => 'Dancer2::Plugin::JsonApi::Registry::Type';
+
+
+done_testing();