diff --git a/web/src/features/settings/account-section.tsx b/web/src/features/settings/account-section.tsx
index 8eb6504..0f7fc38 100644
--- a/web/src/features/settings/account-section.tsx
+++ b/web/src/features/settings/account-section.tsx
@@ -41,6 +41,11 @@ export function AccountSection() {
       switchIdentity(null)
     }
     catch (error) {
+      // 账号在这台设备上的会话已经失效，客户端也已经换成新的游客，退出登录的目的已经达到。
+      if (error instanceof IdentityRenewedError) {
+        window.location.reload()
+        return
+      }
       notificationStore.error(errorMessage(error))
       setBusy(false)
     }
@@ -160,7 +165,7 @@ function PasswordDialog({ onClose }: { onClose: () => void }) {
       onClose()
     }
     catch (error) {
-      notificationStore.error(error instanceof IdentityRenewedError ? '密码没有修改，再试一次。' : errorMessage(error, { INVALID_ARGUMENT: '新密码要 8 到 128 位。' }))
+      notificationStore.error(error instanceof IdentityRenewedError ? '密码没有修改，再试一次。' : errorMessage(error, { INVALID_ARGUMENT: '密码要 8 到 128 位。' }))
       setBusy(false)
     }
   }
@@ -169,7 +174,7 @@ function PasswordDialog({ onClose }: { onClose: () => void }) {
       <form className="form-stack" onSubmit={event => submitted(event, submit)}>
         <label>
           当前密码
-          <input type="password" data-autofocus required autoComplete="current-password" maxLength={128} value={currentPassword} onChange={event => setCurrentPassword(event.target.value)} />
+          <input type="password" data-autofocus required autoComplete="current-password" minLength={8} maxLength={128} value={currentPassword} onChange={event => setCurrentPassword(event.target.value)} />
         </label>
         <label>
           新密码
diff --git a/web/src/features/settings/profile-store.test.ts b/web/src/features/settings/profile-store.test.ts
new file mode 100644
index 0000000..1de5cae
--- /dev/null
+++ b/web/src/features/settings/profile-store.test.ts
@@ -0,0 +1,132 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+
+class FakeStorage {
+  readonly #items = new Map<string, string>()
+
+  get length(): number {
+    return this.#items.size
+  }
+
+  key(index: number): string | null {
+    return [...this.#items.keys()][index] ?? null
+  }
+
+  getItem(key: string): string | null {
+    return this.#items.get(key) ?? null
+  }
+
+  setItem(key: string, value: string): void {
+    this.#items.set(key, value)
+  }
+
+  removeItem(key: string): void {
+    this.#items.delete(key)
+  }
+}
+
+const memberTokenKey = 'alisten.member-token'
+const emailKey = 'alisten.email'
+const member = { id: 'm1', name: 'alice', avatarHash: '' }
+const renewed = { id: 'm2', name: '游客-1a2b', avatarHash: '' }
+
+let local: FakeStorage
+let reload: ReturnType<typeof vi.fn>
+let me: unknown
+
+async function load() {
+  const [{ profileStore, switchIdentity }, { identityEvents }] = await Promise.all([import('./profile-store'), import('@/core/api')])
+  return { profileStore, switchIdentity, identityEvents }
+}
+
+beforeEach(() => {
+  vi.resetModules()
+  // 通知按计时器消失。
+  vi.useFakeTimers()
+  local = new FakeStorage()
+  reload = vi.fn()
+  me = { member }
+  vi.stubGlobal('localStorage', local)
+  vi.stubGlobal('sessionStorage', new FakeStorage())
+  vi.stubGlobal('window', { location: { reload } })
+  vi.stubGlobal('fetch', (path: string, init: RequestInit) => {
+    if (`${init.method} ${path}` !== 'GET /api/me')
+      throw new Error(`没有预期的请求 ${init.method} ${path}`)
+    return Promise.resolve(new Response(JSON.stringify(me), { status: 200 }))
+  })
+})
+
+afterEach(() => {
+  vi.useRealTimers()
+  vi.unstubAllGlobals()
+})
+
+describe('switchIdentity', () => {
+  it('换成新的 token，删除所有票据和本机的邮箱，重新加载页面', async () => {
+    local.setItem(memberTokenKey, 'guest')
+    local.setItem('alisten.ticket.r1', 't1')
+    local.setItem('alisten.ticket.r2', 't2')
+    local.setItem(emailKey, 'alice@example.com')
+    local.setItem('alisten.volume', '80')
+    const { switchIdentity } = await load()
+    switchIdentity('account')
+
+    expect(local.getItem(memberTokenKey)).toBe('account')
+    expect(local.getItem('alisten.ticket.r1')).toBeNull()
+    expect(local.getItem('alisten.ticket.r2')).toBeNull()
+    expect(local.getItem(emailKey)).toBeNull()
+    expect(local.getItem('alisten.volume')).toBe('80')
+    expect(reload).toHaveBeenCalledOnce()
+  })
+
+  it('退出登录时删除 token，重新加载之后换成新的游客', async () => {
+    local.setItem(memberTokenKey, 'account')
+    local.setItem('alisten.ticket.r1', 't1')
+    local.setItem(emailKey, 'alice@example.com')
+    const { switchIdentity } = await load()
+    switchIdentity(null)
+
+    expect(local.getItem(memberTokenKey)).toBeNull()
+    expect(local.getItem('alisten.ticket.r1')).toBeNull()
+    expect(local.getItem(emailKey)).toBeNull()
+    expect(reload).toHaveBeenCalledOnce()
+  })
+})
+
+describe('账号状态', () => {
+  beforeEach(() => {
+    local.setItem(memberTokenKey, 'good')
+  })
+
+  it('取回资料时一并取回账号', async () => {
+    me = { member, account: { username: 'alice' } }
+    const { profileStore } = await load()
+    await profileStore.load()
+    expect(profileStore.state).toMatchObject({ member, account: { username: 'alice' } })
+  })
+
+  it('游客没有账号', async () => {
+    const { profileStore } = await load()
+    profileStore.setAccount({ username: 'alice' })
+    await profileStore.load()
+    expect(profileStore.state).toMatchObject({ member, account: null })
+  })
+
+  it('注册之后设置账号', async () => {
+    const { profileStore } = await load()
+    await profileStore.load()
+    profileStore.setAccount({ username: 'alice' })
+    expect(profileStore.state).toMatchObject({ member, account: { username: 'alice' } })
+  })
+
+  it('身份被拒绝或更换之后没有账号', async () => {
+    const { profileStore, identityEvents } = await load()
+    profileStore.start()
+    profileStore.setAccount({ username: 'alice' })
+    identityEvents.emit({ kind: 'rejected' })
+    expect(profileStore.state).toMatchObject({ member: null, account: null })
+
+    profileStore.setAccount({ username: 'alice' })
+    identityEvents.emit({ kind: 'renewed', member: renewed })
+    expect(profileStore.state).toMatchObject({ member: renewed, account: null })
+  })
+})