diff --git a/packages/backend/native-utils/__test__/index.spec.mjs b/packages/backend/native-utils/__test__/index.spec.mjs
index 1788dbb061..6e6a91858c 100644
--- a/packages/backend/native-utils/__test__/index.spec.mjs
+++ b/packages/backend/native-utils/__test__/index.spec.mjs
@@ -1,6 +1,12 @@
 import test from "ava";
 
-import { convertId, IdConvertType } from "../built/index.js";
+import {
+	convertId,
+	IdConvertType,
+	nativeInitIdGenerator,
+	nativeCreateId,
+	nativeRandomStr,
+} from "../built/index.js";
 
 test("convert to mastodon id", (t) => {
 	t.is(convertId("9gf61ehcxv", IdConvertType.MastodonId), "960365976481219");
@@ -13,3 +19,14 @@ test("convert to mastodon id", (t) => {
 		"3494513243013053824",
 	);
 });
+
+test("create cuid2 with timestamp prefix", (t) => {
+	nativeInitIdGenerator(16, "");
+	t.not(nativeCreateId(BigInt(Date.now())), nativeCreateId(BigInt(Date.now())));
+	t.is(nativeCreateId(BigInt(Date.now())).length, 16);
+});
+
+test("create random string", (t) => {
+	t.not(nativeRandomStr(16), nativeRandomStr(16));
+	t.is(nativeRandomStr(24).length, 24);
+});