diff --git a/CHANGES.md b/CHANGES.md
index 7c6cb3aa..0c59a0f8 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -13,6 +13,8 @@
 
 ### misc
 
+- [ADD] E2E テストに `"type": "switched"` のテストを追加する
+  - @voluntas
 - [CHANGE] canary リリース方法を `canary.py` に変更する
   - `release_canary.sh` は削除
   - @voluntas
diff --git a/examples/sendonly/main.mts b/examples/sendonly/main.mts
index e4d250a6..a4ca9a4e 100644
--- a/examples/sendonly/main.mts
+++ b/examples/sendonly/main.mts
@@ -1,5 +1,6 @@
 import Sora, {
   type SignalingNotifyMessage,
+  type SignalingEvent,
   type ConnectionPublisher,
   type SoraConnection,
 } from 'sora-js-sdk'
@@ -81,7 +82,10 @@ class SoraClient {
     this.metadata = { access_token: access_token }
 
     this.connection = this.sora.sendonly(this.channelId, this.metadata, this.options)
-    this.connection.on('notify', this.onnotify.bind(this))
+    this.connection.on('notify', this.onNotify.bind(this))
+
+    // E2E テスト用のコード
+    this.connection.on('signaling', this.onSignaling.bind(this))
   }
 
   async connect(stream: MediaStream): Promise<void> {
@@ -109,7 +113,7 @@ class SoraClient {
     return this.connection.pc.getStats()
   }
 
-  private onnotify(event: SignalingNotifyMessage): void {
+  private onNotify(event: SignalingNotifyMessage): void {
     if (
       event.event_type === 'connection.created' &&
       this.connection.connectionId === event.connection_id
@@ -120,4 +124,11 @@ class SoraClient {
       }
     }
   }
+
+  // E2E テスト用のコード
+  private onSignaling(event: SignalingEvent): void {
+    if (event.type === 'onmessage-switched') {
+      console.log('[signaling]', event.type, event.transportType)
+    }
+  }
 }
diff --git a/package.json b/package.json
index 421a4da8..90e233ea 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,9 @@
     "url": "https://discord.gg/shiguredo"
   },
   "homepage": "https://github.com/shiguredo/sora-js-sdk#readme",
-  "files": ["dist"],
+  "files": [
+    "dist"
+  ],
   "devDependencies": {
     "@biomejs/biome": "1.9.4",
     "@playwright/test": "1.49.0",
@@ -41,8 +43,8 @@
     "vite": "6.0.1",
     "vitest": "2.1.6"
   },
-  "packageManager": "pnpm@9.14.3",
+  "packageManager": "pnpm@9.15.0",
   "engines": {
     "node": ">=18"
   }
-}
+}
\ No newline at end of file
diff --git a/tests/switched.spec.ts b/tests/switched.spec.ts
new file mode 100644
index 00000000..3a36986d
--- /dev/null
+++ b/tests/switched.spec.ts
@@ -0,0 +1,88 @@
+import { expect, test } from '@playwright/test'
+
+test('sendonly type:switched pages', async ({ browser }) => {
+  // 新しいページを2つ作成
+  const sendonly = await browser.newPage()
+
+  sendonly.on('console', (msg) => {
+    console.log(msg.type(), msg.text())
+  })
+
+  // それぞれのページに対して操作を行う
+  await sendonly.goto('http://localhost:9000/sendonly/')
+
+  // SDK バージョンの表示
+  await sendonly.waitForSelector('#sdk-version')
+  const sendonlySdkVersion = await sendonly.$eval('#sdk-version', (el) => el.textContent)
+  console.log(`sendonly sdkVersion=${sendonlySdkVersion}`)
+
+  await sendonly.click('#connect')
+  // console.log に [signaling] switched が出力されるまで待機するための Promise を作成する
+  const consolePromise = sendonly.waitForEvent('console')
+
+  // #sendrecv1-connection-id 要素が存在し、その内容が空でないことを確認するまで待つ
+  await sendonly.waitForSelector('#connection-id:not(:empty)')
+
+  // #sendonly-connection-id 要素の内容を取得
+  const sendonlyConnectionId = await sendonly.$eval('#connection-id', (el) => el.textContent)
+  console.log(`sendonly connectionId=${sendonlyConnectionId}`)
+
+  // レース対策
+  await sendonly.waitForTimeout(3000)
+
+  // Console log の Promise が解決されるまで待機する
+  const msg = await consolePromise
+  // log [signaling] switched websocket が出力されるので、args 0/1/2 をそれぞれチェックする
+  // [signaling]
+  const value1 = await msg.args()[0].jsonValue()
+  expect(value1).toBe('[signaling]')
+  // switched
+  const value2 = await msg.args()[1].jsonValue()
+  expect(value2).toBe('onmessage-switched')
+  // websocket
+  const value3 = await msg.args()[2].jsonValue()
+  expect(value3).toBe('websocket')
+
+  // 'Get Stats' ボタンをクリックして統計情報を取得
+  await sendonly.click('#get-stats')
+
+  // 統計情報が表示されるまで待機
+  await sendonly.waitForSelector('#stats-report')
+  // データセットから統計情報を取得
+  const sendonlyStatsReportJson: Record<string, unknown>[] = await sendonly.evaluate(() => {
+    const statsReportDiv = document.querySelector('#stats-report') as HTMLDivElement
+    return statsReportDiv ? JSON.parse(statsReportDiv.dataset.statsReportJson || '[]') : []
+  })
+
+  // sendonly audio codec
+  const sendonlyAudioCodecStats = sendonlyStatsReportJson.find(
+    (report) => report.type === 'codec' && report.mimeType === 'audio/opus',
+  )
+  expect(sendonlyAudioCodecStats).toBeDefined()
+
+  // sendonly audio outbound-rtp
+  const sendonlyAudioOutboundRtp = sendonlyStatsReportJson.find(
+    (report) => report.type === 'outbound-rtp' && report.kind === 'audio',
+  )
+  expect(sendonlyAudioOutboundRtp).toBeDefined()
+  expect(sendonlyAudioOutboundRtp?.bytesSent).toBeGreaterThan(0)
+  expect(sendonlyAudioOutboundRtp?.packetsSent).toBeGreaterThan(0)
+
+  // sendonly video codec
+  const sendonlyVideoCodecStats = sendonlyStatsReportJson.find(
+    (stats) => stats.type === 'codec' && stats.mimeType === 'video/VP9',
+  )
+  expect(sendonlyVideoCodecStats).toBeDefined()
+
+  // sendonly video outbound-rtp
+  const sendonlyVideoOutboundRtpStats = sendonlyStatsReportJson.find(
+    (stats) => stats.type === 'outbound-rtp' && stats.kind === 'video',
+  )
+  expect(sendonlyVideoOutboundRtpStats).toBeDefined()
+  expect(sendonlyVideoOutboundRtpStats?.bytesSent).toBeGreaterThan(0)
+  expect(sendonlyVideoOutboundRtpStats?.packetsSent).toBeGreaterThan(0)
+
+  await sendonly.click('#disconnect')
+
+  await sendonly.close()
+})