diff --git a/src/tests.ts b/src/tests.ts
index 42f4ca7..6438366 100644
--- a/src/tests.ts
+++ b/src/tests.ts
@@ -2,6 +2,7 @@ import { Implements } from "@thilawyn/traitify-ts"
 import { z } from "zod"
 import { ZodSchemaClass } from "./ZodSchemaClass"
 import { MobXObservableZodSchemaObject } from "./traits/MobXObservableZodSchemaObject"
+import { stripZodObjectDefaults } from "./util"
 
 
 // const exp = zodSchemaClass
@@ -43,6 +44,16 @@ const exp = ZodSchemaClass(
     .expresses(MobXObservableZodSchemaObject)
     .build()
 
+const test = stripZodObjectDefaults(
+    z.object({
+        /** User ID */
+        id: z.bigint().default(-1n),
+
+        /** Username */
+        name: z.string(),
+    })
+)
+
 
 @exp.staticImplements
 class User extends exp.extends implements Implements<typeof exp> {}