diff --git a/napi/transform/test/transform.test.ts b/napi/transform/test/transform.test.ts
index faad8be0d9a2e..fa7aeaecd2909 100644
--- a/napi/transform/test/transform.test.ts
+++ b/napi/transform/test/transform.test.ts
@@ -2,7 +2,7 @@ import { assert, describe, it } from 'vitest';
 
 import oxc from './index';
 
-describe('transform', () => {
+describe('simple', () => {
   const code = 'export class A<T> {}';
 
   it('matches output', () => {
@@ -31,6 +31,25 @@ describe('transform', () => {
   });
 });
 
+describe('transform', () => {
+  it('should not transform by default', () => {
+    const cases = [
+      '() => {};',
+      'a ** b;',
+      'async function foo() {}',
+      '({ ...x });',
+      'try {} catch {}',
+      'a ?? b;',
+      'a ||= b;',
+      'class foo {\n\tstatic {}\n}',
+    ];
+    for (const code of cases) {
+      const ret = oxc.transform('test.ts', code);
+      assert.equal(ret.code.trim(), code);
+    }
+  });
+});
+
 describe('modules', () => {
   it('should transform export = and import ', () => {
     const code = `