diff --git a/packages/koishi-core/src/server.ts b/packages/koishi-core/src/server.ts
index e735862abc..fcd6fd5102 100644
--- a/packages/koishi-core/src/server.ts
+++ b/packages/koishi-core/src/server.ts
@@ -3,7 +3,7 @@ import debug from 'debug'
 import * as http from 'http'
 import { errors } from './messages'
 import { createHmac } from 'crypto'
-import { camelCase, snakeCase, capitalize, paramCase } from 'koishi-utils'
+import { camelCase, snakeCase, capitalize, paramCase, CQCode } from 'koishi-utils'
 import { Meta, VersionInfo, ContextType } from './meta'
 import { App, AppOptions } from './app'
 import { CQResponse } from './sender'
@@ -57,12 +57,17 @@ export abstract class Server {
     // polyfill CQHTTP 3.x events
     // https://cqhttp.cc/docs/4.12/#/UpgradeGuide
     /* eslint-disable dot-notation */
-    if (typeof meta.anonymous === 'string') {
-      meta.anonymous = {
-        name: meta.anonymous,
-        flag: meta['anonymousFlag'],
+    if (meta.postType === 'message') {
+      if (typeof meta.anonymous === 'string') {
+        meta.anonymous = {
+          name: meta.anonymous,
+          flag: meta['anonymousFlag'],
+        }
+        delete meta['anonymousFlag']
+      }
+      if (Array.isArray(meta.message)) {
+        meta.message = CQCode.stringifyAll(meta.message)
       }
-      delete meta['anonymousFlag']
     // @ts-ignore
     } else if (meta.postType === 'event') {
       meta.postType = 'notice'
diff --git a/packages/koishi-core/tests/runtime.spec.ts b/packages/koishi-core/tests/runtime.spec.ts
index f7800a8dd2..53b20dfd93 100644
--- a/packages/koishi-core/tests/runtime.spec.ts
+++ b/packages/koishi-core/tests/runtime.spec.ts
@@ -12,14 +12,12 @@ jest.setTimeout(1000)
 
 beforeAll(() => app.start())
 
-afterAll(() => {
-  app.stop()
+afterAll(async () => {
+  await app.stop()
   server.close()
 })
 
 app.command('foo <text>', { checkArgCount: true })
-  // make coverage happy
-  .userFields(['name', 'flag', 'authority', 'usage'])
   .shortcut('bar1', { args: ['bar'] })
   .shortcut('bar4', { oneArg: true, fuzzy: true })
   .action(({ meta }, bar) => {
diff --git a/packages/koishi-core/tests/validation.spec.ts b/packages/koishi-core/tests/validation.spec.ts
index 185b4a9b47..e65da0162b 100644
--- a/packages/koishi-core/tests/validation.spec.ts
+++ b/packages/koishi-core/tests/validation.spec.ts
@@ -11,10 +11,13 @@ const path = resolve(__dirname, '../temp')
 
 const server = createServer()
 const app = createApp({
-  database: { level: { path } }
+  database: { level: { path } },
 })
 
 app.command('cmd1', { authority: 2, maxUsage: 1 })
+  // make coverage happy
+  .userFields(['name', 'flag', 'authority', 'usage'])
+  .groupFields(['id', 'flag', 'assignee'])
   .option('--bar', '', { authority: 3 })
   .option('--baz', '', { notUsage: true })
   .action(({ meta }) => meta.$send('1:' + meta.$user.id))
@@ -82,19 +85,28 @@ describe('middleware validation', () => {
 
 describe('command validation', () => {
   test('check authority', async () => {
+    app.command('cmd1', { showWarning: true })
     await session2.shouldHaveResponse('cmd1', messages.LOW_AUTHORITY)
     await session1.shouldHaveResponse('cmd1 --bar', messages.LOW_AUTHORITY)
+    app.command('cmd1', { showWarning: false })
+    await session2.shouldHaveNoResponse('cmd1')
   })
 
   test('check usage', async () => {
+    app.command('cmd1', { showWarning: true })
     await session1.shouldHaveResponse('cmd1', '1:123')
     await session1.shouldHaveResponse('cmd1 --baz', '1:123')
     await session1.shouldHaveResponse('cmd1', messages.USAGE_EXHAUSTED)
     await session1.shouldHaveResponse('cmd1 --baz', '1:123')
+    app.command('cmd1', { showWarning: false })
+    await session1.shouldHaveNoResponse('cmd1')
   })
 
   test('check frequency', async () => {
+    app.command('cmd2', { showWarning: true })
     await session2.shouldHaveResponse('cmd2', '2:456')
     await session2.shouldHaveResponse('cmd2', messages.TOO_FREQUENT)
+    app.command('cmd2', { showWarning: false })
+    await session1.shouldHaveNoResponse('cmd2')
   })
 })
diff --git a/packages/koishi-core/tests/ws-client.spec.ts b/packages/koishi-core/tests/ws-client.spec.ts
index 734b750890..ca498afd3c 100644
--- a/packages/koishi-core/tests/ws-client.spec.ts
+++ b/packages/koishi-core/tests/ws-client.spec.ts
@@ -66,6 +66,7 @@ describe('WebSocket Server', () => {
   })
 
   test('make polyfills', async () => {
+    await postMeta({ postType: 'message', groupId: 123, message: [{ type: 'text', data: { text: 'foo' } }] as any })
     await postMeta({ postType: 'message', groupId: 123, message: '', anonymous: 'foo' as any, ['anonymousFlag' as any]: 'bar' })
     await postMeta({ postType: 'request', userId: 123, requestType: 'friend', message: 'baz' })
     await postMeta({ postType: 'event' as any, userId: 123, ['event' as any]: 'frient_add' })