diff --git a/client/settings.ts b/client/settings.ts
index c00ce2a7..fb7ab15e 100644
--- a/client/settings.ts
+++ b/client/settings.ts
@@ -1 +1,159 @@
-// TODO: launch test one by one, using authent Bearer.
+interface Result {
+  label?: string
+  messages: string[]
+  next?: string | ((r: Result) => void)
+  ok: boolean
+  test: string
+}
+
+function launchTests (): void {
+  let tokenType: string
+  let accessToken: string
+  let refreshToken: string
+
+  const container = document.querySelector('div')
+  if (!container) {
+    throw new Error('Cant find main container')
+  }
+  const ul = document.createElement('ul')
+  container.innerHTML = ''
+  container.append(ul)
+
+  function appendMessages (result: Result): void {
+    const li = document.createElement('li')
+
+    const label = document.createElement('span')
+    label.textContent = (result.label ?? result.test) + ': '
+    li.append(label)
+
+    const state = document.createElement('b')
+    if (result.ok) {
+      state.textContent = 'OK'
+      state.style.color = 'green'
+    } else {
+      state.textContent = 'KO'
+      state.style.color = 'red'
+    }
+    li.append(state)
+
+    if (result.messages.length) {
+      const messageUl = document.createElement('ul')
+      for (let i = 0; i < result.messages.length; i++) {
+        const messageLi = document.createElement('li')
+        messageLi.textContent = result.messages[i]
+        messageUl.append(messageLi)
+      }
+      li.append(messageUl)
+    }
+
+    ul.append(li)
+  }
+
+  function testBrowser (): Result {
+    const r: Result = {
+      ok: false,
+      next: 'backend',
+      messages: [],
+      test: 'browser',
+      label: 'Browser'
+    }
+
+    if (!window.fetch) {
+      r.messages.push('Missing fetch function')
+    }
+
+    if (!window.localStorage) {
+      r.messages.push('Browser has no local storage')
+    } else {
+      tokenType = window.localStorage.getItem('token_type') ?? ''
+      accessToken = window.localStorage.getItem('access_token') ?? ''
+      refreshToken = window.localStorage.getItem('refresh_token') ?? ''
+      if (tokenType === '') {
+        r.messages.push('Your browser is not authenticated on your Peertube instance (no token_type)')
+      } else if (tokenType.toLowerCase() !== 'bearer') {
+        r.messages.push('Your brower is authenticated with an unknown token type: ' + tokenType)
+      } else if (accessToken === '') {
+        r.messages.push('Your browser is not authenticated on your Peertube instance (no access_token)')
+      } else if (refreshToken === '') {
+        r.messages.push('Your browser is not authenticated on your Peertube instance (no refresh_token)')
+      }
+    }
+
+    r.ok = r.messages.length === 0
+    return r
+  }
+
+  let testUrl: string = window.location.pathname
+  if (testUrl[testUrl.length - 1] !== '/') testUrl += '/'
+  testUrl += 'test'
+  async function callTest (test: string): Promise<Result> {
+    const response = await window.fetch(testUrl, {
+      method: 'POST',
+      headers: new Headers({
+        Authorization: 'Bearer ' + accessToken,
+        'content-type': 'application/json;charset=UTF-8'
+      }),
+      body: JSON.stringify({
+        test: test
+      })
+    })
+    const data = await response.json()
+    if (!response.ok) {
+      return {
+        test: test,
+        messages: ['Unknown error'],
+        ok: false
+      }
+    }
+    if ((typeof data) !== 'object') {
+      return {
+        test: test,
+        messages: ['Incorrect reponse type: ' + (typeof data)],
+        ok: false
+      }
+    }
+    return data as Result
+  }
+
+  async function machine (result: Result): Promise<void> {
+    appendMessages(result)
+    if (!result.ok) {
+      return
+    }
+    if (!result.next) {
+      return
+    }
+    const waiting = document.createElement('li')
+    waiting.innerHTML = '<i>Testing...</i>'
+    ul.append(waiting)
+    if ((typeof result.next) === 'function') {
+      const r: Result = (result.next as Function)()
+      waiting.remove()
+      await machine(r)
+    } else {
+      console.log('Calling test ' + (result.next as string))
+      const r: Result = await callTest(result.next as string)
+      waiting.remove()
+      await machine(r)
+    }
+  }
+
+  machine({
+    label: 'Starting tests',
+    messages: [],
+    next: testBrowser,
+    ok: true,
+    test: 'start'
+  }).then(
+    () => {},
+    (error) => {
+      console.error(error)
+      const d = document.createElement('div')
+      d.style.color = 'red'
+      d.textContent = error
+      document.body.append(d)
+    }
+  )
+}
+
+launchTests()
diff --git a/server/lib/routers/settings.ts b/server/lib/routers/settings.ts
index 20189b88..61b1d120 100644
--- a/server/lib/routers/settings.ts
+++ b/server/lib/routers/settings.ts
@@ -1,6 +1,14 @@
 import type { Router, Request, Response, NextFunction } from 'express'
 import { getBaseStaticRoute } from '../helpers'
 
+interface Result {
+  label?: string
+  messages: string[]
+  next?: string
+  ok: boolean
+  test: string
+}
+
 async function initSettingsRouter ({
   peertubeHelpers,
   getRouter
@@ -30,11 +38,22 @@ async function initSettingsRouter ({
 
       const test: string = req.body.test || ''
       logger.info('Accessing peertube-plugin-livechat diagnostic tool, test "' + test + '".')
-      const result: any = {
-        test: test,
-        message: null,
-        next: null,
-        ok: false
+
+      let result: Result
+      if (test === 'backend') {
+        result = {
+          ok: true,
+          label: 'Backend connection',
+          test: test,
+          messages: []
+        }
+      } else {
+        result = {
+          label: test,
+          test: test,
+          messages: ['Unknown test'],
+          ok: false
+        }
       }
 
       res.status(200)