diff --git a/src/tests.ts b/src/tests.ts
index 9a8400d..59df546 100644
--- a/src/tests.ts
+++ b/src/tests.ts
@@ -1,4 +1,20 @@
 import { trait } from "."
 
 
-const PrintsHelloOnNew = trait()
+const PrintsHelloOnNew = trait()(Super =>
+    class PrintsHelloOnNew extends Super {
+        constructor(...args: any[]) {
+            super(...args)
+            console.log("Hello!")
+        }
+    }
+)
+
+const Identifiable = <ID>() =>
+    trait<{ id: ID }>()(Super =>
+        class Identifiable extends Super {
+            equals(el: Identifiable) {
+                return this.id === el.id
+            }
+        }
+    )