diff --git a/src/effect/schema/class/tests.ts b/src/effect/schema/class/tests.ts
index 25e478d..859af98 100644
--- a/src/effect/schema/class/tests.ts
+++ b/src/effect/schema/class/tests.ts
@@ -1,4 +1,5 @@
 import { Schema as S } from "@effect/schema"
+import { reaction, runInAction } from "mobx"
 import { pipe } from "remeda"
 import { MobXObservable } from "./MobXObservable"
 import { MutableTaggedClass } from "./MutableTaggedClass"
@@ -12,13 +13,17 @@ class User extends pipe(
     MobXObservable,
 ) {}
 
-const user1 = new User({ id: 1n, role: "BasicUser" })
-user1.id = 1n
+const user1 = new User({ id: -1n, role: "BasicUser" })
+reaction(() => user1.id, id => console.log(`user1 id changed: ${ id }`))
 
 
 class Admin extends User.extend<Admin>("Admin")({
     // role: S.Literal("Admin")
 }) {}
 
-const user2 = new Admin({ id: 2n, role: "Admin" })
-user2.id = 2n
+const user2 = new Admin({ id: -1n, role: "Admin" })
+reaction(() => user2.id, id => console.log(`user2 id changed: ${ id }`))
+
+
+runInAction(() => { user1.id = 1n })
+runInAction(() => { user2.id = 2n })