diff --git a/site/docs/advanced/cluster-client.md b/site/docs/advanced/cluster-client.md
index bbe6b834f2..a36a72b683 100644
--- a/site/docs/advanced/cluster-client.md
+++ b/site/docs/advanced/cluster-client.md
@@ -70,7 +70,7 @@ We abstract the client interface into the following two broad categories, which
 Client example
 
 ```js
-const Base = require('sdk-base');
+const { Base } = require('sdk-base');
 
 class Client extends Base {
   constructor(options) {
@@ -168,8 +168,8 @@ In the following I will use a simple example to introduce how to make a client s
 
 ```js
 // registry_client.js
-const URL = require('url');
-const Base = require('sdk-base');
+const { parse } = require('node:url');
+const { Base } = require('sdk-base');
 
 class RegistryClient extends Base {
   constructor(options) {
@@ -236,7 +236,7 @@ class RegistryClient extends Base {
     if (changed) {
       this.emit(
         key,
-        this._registered.get(key).map((url) => URL.parse(url, true)),
+        this._registered.get(key).map((url) => parse(url, true)),
       );
     }
   }
diff --git a/site/docs/advanced/cluster-client.zh-CN.md b/site/docs/advanced/cluster-client.zh-CN.md
index 9e6ba1a33a..df39c9e324 100644
--- a/site/docs/advanced/cluster-client.zh-CN.md
+++ b/site/docs/advanced/cluster-client.zh-CN.md
@@ -69,7 +69,7 @@ win /   +------------------+  \ lose
 客户端示例
 
 ```js
-const Base = require('sdk-base');
+const { Base } = require('sdk-base');
 
 class Client extends Base {
   constructor(options) {
@@ -165,8 +165,8 @@ Leader 和 Follower 通过下面的协议进行数据交换：
 
 ```js
 // registry_client.js
-const URL = require('url');
-const Base = require('sdk-base');
+const { parse } = require('node:url');
+const { Base } = require('sdk-base');
 
 class RegistryClient extends Base {
   constructor(options) {
@@ -233,7 +233,7 @@ class RegistryClient extends Base {
     if (changed) {
       this.emit(
         key,
-        this._registered.get(key).map(url => URL.parse(url, true)),
+        this._registered.get(key).map(url => parse(url, true)),
       );
     }
   }
@@ -554,4 +554,4 @@ class APIClient extends APIClientBase {
 }
 
 module.exports = APIClient;
-```
\ No newline at end of file
+```
diff --git a/test/cluster1/cluster-client.test.ts b/test/cluster1/cluster-client.test.ts
index bdea52dfb7..cbbd71b0df 100644
--- a/test/cluster1/cluster-client.test.ts
+++ b/test/cluster1/cluster-client.test.ts
@@ -1,4 +1,5 @@
 import { strict as assert } from 'node:assert';
+import { scheduler } from 'node:timers/promises';
 import { mm } from '@eggjs/mock';
 import { MockApplication, createApp, singleProcessApp } from '../utils.js';
 
@@ -15,45 +16,35 @@ describe('test/cluster1/cluster-client.test.ts', () => {
     after(async () => {
       await app.close();
       const agentInnerClient = app.agent.registryClient[innerClient];
-      assert(agentInnerClient._realClient.closed === true);
-      mm.restore();
+      assert.equal(agentInnerClient._realClient.closed, true);
+      await mm.restore();
     });
 
-    it('should publish & subscribe', () => {
-      return app.httpRequest()
+    it('should publish & subscribe', async () => {
+      await app.httpRequest()
         .post('/publish')
         .send({ value: 'www.testme.com' })
         .expect('ok')
-        .expect(200)
-        .then(() => {
-          return new Promise(resolve => {
-            setTimeout(resolve, 500);
-          });
-        })
-        .then(() => {
-          return app.httpRequest()
-            .get('/getHosts')
-            .expect('www.testme.com:20880')
-            .expect(200);
-        });
+        .expect(200);
+      await scheduler.wait(500);
+      await app.httpRequest()
+        .get('/getHosts')
+        .expect('www.testme.com:20880')
+        .expect(200);
     });
 
-    it('should get default cluster response timeout', () => {
-      return app.httpRequest()
+    it('should get default cluster response timeout', async () => {
+      const res = await app.httpRequest()
         .get('/getDefaultTimeout')
-        .expect(200)
-        .then(res => {
-          assert(res.text === '60000');
-        });
+        .expect(200);
+      assert.equal(res.text, '60000');
     });
 
-    it('should get overwrite cluster response timeout', () => {
-      return app.httpRequest()
+    it('should get overwrite cluster response timeout', async () => {
+      const res = await app.httpRequest()
         .get('/getOverwriteTimeout')
-        .expect(200)
-        .then(res => {
-          assert(res.text === '1000');
-        });
+        .expect(200);
+      assert.equal(res.text, '1000');
     });
   });
 
@@ -65,45 +56,35 @@ describe('test/cluster1/cluster-client.test.ts', () => {
     after(async () => {
       await app.close();
       const agentInnerClient = app.agent.registryClient[innerClient];
-      assert(agentInnerClient._realClient.closed === true);
+      assert.equal(agentInnerClient._realClient.closed, true);
       mm.restore();
     });
 
-    it('should publish & subscribe', () => {
-      return app.httpRequest()
+    it('should publish & subscribe', async () => {
+      await app.httpRequest()
         .post('/publish')
         .send({ value: 'www.testme.com' })
         .expect('ok')
-        .expect(200)
-        .then(() => {
-          return new Promise(resolve => {
-            setTimeout(resolve, 500);
-          });
-        })
-        .then(() => {
-          return app.httpRequest()
-            .get('/getHosts')
-            .expect('www.testme.com:20880')
-            .expect(200);
-        });
+        .expect(200);
+      await scheduler.wait(500);
+      await app.httpRequest()
+        .get('/getHosts')
+        .expect('www.testme.com:20880')
+        .expect(200);
     });
 
-    it('should get default cluster response timeout', () => {
-      return app.httpRequest()
+    it('should get default cluster response timeout', async () => {
+      const res = await app.httpRequest()
         .get('/getDefaultTimeout')
-        .expect(200)
-        .then(res => {
-          assert(res.text === '60000');
-        });
+        .expect(200);
+      assert.equal(res.text, '60000');
     });
 
-    it('should get overwrite cluster response timeout', () => {
-      return app.httpRequest()
+    it('should get overwrite cluster response timeout', async () => {
+      const res = await app.httpRequest()
         .get('/getOverwriteTimeout')
-        .expect(200)
-        .then(res => {
-          assert(res.text === '1000');
-        });
+        .expect(200);
+      assert.equal(res.text, '1000');
     });
   });
 });
diff --git a/test/fixtures/apps/cluster_mod_app/agent.js b/test/fixtures/apps/cluster_mod_app/agent.js
index 1abc3bc6c6..9142c8ffb8 100644
--- a/test/fixtures/apps/cluster_mod_app/agent.js
+++ b/test/fixtures/apps/cluster_mod_app/agent.js
@@ -2,18 +2,26 @@ const ApiClient = require('./lib/api_client');
 const ApiClient2 = require('./lib/api_client_2');
 const RegistryClient = require('./lib/registry_client');
 
-module.exports = function(agent) {
-  agent.registryClient = agent.cluster(RegistryClient).create();
-  agent.apiClient = new ApiClient({
-    cluster: agent.cluster,
-  });
-  agent.apiClient2 = new ApiClient2({
-    cluster: agent.cluster,
-  });
+module.exports = class Boot {
+  constructor(agent) {
+    this.agent = agent;
+  }
 
-  agent.beforeStart(async function() {
+  async didLoad() {
+    const agent = this.agent;
+    agent.registryClient = agent.cluster(RegistryClient).create();
+    agent.apiClient = new ApiClient({
+      cluster: agent.cluster,
+    });
+    agent.apiClient2 = new ApiClient2({
+      cluster: agent.cluster,
+    });
+  }
+
+  async willReady() {
+    const agent = this.agent;
     await agent.registryClient.ready();
     await agent.apiClient.ready();
     await agent.apiClient2.ready();
-  });
+  }
 };
diff --git a/test/fixtures/apps/cluster_mod_app/lib/registry_client.js b/test/fixtures/apps/cluster_mod_app/lib/registry_client.js
index e5969ff3a8..c97a72418a 100644
--- a/test/fixtures/apps/cluster_mod_app/lib/registry_client.js
+++ b/test/fixtures/apps/cluster_mod_app/lib/registry_client.js
@@ -1,7 +1,5 @@
-'use strict';
-
-const URL = require('url');
-const Base = require('sdk-base');
+const { parse } = require('node:url');
+const { Base } = require('sdk-base');
 
 class RegistryClient extends Base {
   constructor() {
@@ -45,7 +43,7 @@ class RegistryClient extends Base {
     } else {
       this._registered.set(key, [reg.publishData]);
     }
-    this.emit(key, this._registered.get(key).map(url => new URL.parse(url, true)));
+    this.emit(key, this._registered.get(key).map(url => parse(url, true)));
   }
 
   close() {
diff --git a/test/lib/core/messenger/local.test.ts b/test/lib/core/messenger/local.test.ts
index ebac375cbc..8b1126eb80 100644
--- a/test/lib/core/messenger/local.test.ts
+++ b/test/lib/core/messenger/local.test.ts
@@ -1,10 +1,10 @@
 import { strict as assert } from 'node:assert';
 import { mm } from '@eggjs/mock';
 import { pending } from 'pedding';
-import { singleProcessApp, MockApplication } from '../../../utils.js';
+import { singleProcessApp, SingleModeApplication } from '../../../utils.js';
 
 describe('test/lib/core/messenger/local.test.ts', () => {
-  let app: MockApplication;
+  let app: SingleModeApplication;
 
   before(async () => {
     app = await singleProcessApp('apps/demo');
@@ -144,10 +144,11 @@ describe('test/lib/core/messenger/local.test.ts', () => {
         done();
       });
 
-      let res = app.messenger.sendTo(process.pid, 'sendTo-event', { foo: 'bar' });
+      // keep compatible with old code, use process.pid as number
+      let res = (app.messenger as any).sendTo(process.pid, 'sendTo-event', { foo: 'bar' });
       assert(res === app.messenger);
       // should ignore if target process is not self
-      res = app.messenger.sendTo(1, 'sendTo-event', { foo: 'bar' });
+      res = app.messenger.sendTo('1', 'sendTo-event', { foo: 'bar' });
       assert(res === app.messenger);
     });
 
@@ -162,7 +163,7 @@ describe('test/lib/core/messenger/local.test.ts', () => {
         done();
       });
 
-      app.agent.messenger.sendTo(process.pid, 'sendTo-event', { foo: 'bar' });
+      app.agent.messenger.sendTo(String(process.pid), 'sendTo-event', { foo: 'bar' });
     });
   });
 
@@ -201,7 +202,7 @@ describe('test/lib/core/messenger/local.test.ts', () => {
 
   describe('onMessage()', () => {
     it('should ignore if message format error', () => {
-      app.messenger.onMessage();
+      (app.messenger as any).onMessage();
       app.messenger.onMessage('foo');
       app.messenger.onMessage({ action: 1 });
     });
diff --git a/test/utils.ts b/test/utils.ts
index ac06760b4d..d7d254d23f 100644
--- a/test/utils.ts
+++ b/test/utils.ts
@@ -13,6 +13,7 @@ import { Application as Koa } from '@eggjs/koa';
 import { request } from '@eggjs/supertest';
 import {
   startEgg, StartEggOptions,
+  type SingleModeAgent,
 } from '../src/index.js';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
@@ -24,6 +25,10 @@ export async function rimraf(target: string) {
 }
 
 export { MockApplication, MockOptions, MockClusterOptions, mm };
+export interface SingleModeApplication extends MockApplication {
+  agent: SingleModeAgent;
+}
+
 export const restore = () => mm.restore();
 
 export function app(name: string | MockOptions, options?: MockOptions) {
@@ -54,7 +59,7 @@ export function cluster(name: string | MockClusterOptions, options?: MockCluster
  * @param {Object} [options] - optional
  * @return {App} app - Application object.
  */
-export async function singleProcessApp(baseDir: string, options: StartEggOptions = {}): Promise<MockApplication> {
+export async function singleProcessApp(baseDir: string, options: StartEggOptions = {}): Promise<SingleModeApplication> {
   if (!baseDir.startsWith('/')) {
     baseDir = path.join(__dirname, 'fixtures', baseDir);
   }
@@ -62,7 +67,7 @@ export async function singleProcessApp(baseDir: string, options: StartEggOptions
   options.baseDir = baseDir;
   const app = await startEgg(options);
   Reflect.set(app, 'httpRequest', () => request(app.callback()));
-  return app as unknown as MockApplication;
+  return app as unknown as SingleModeApplication;
 }
 
 let localServer: http.Server | undefined;