Debug WebdriverIO Tests: logLevel


I wrote a blog post for my team blog at work. You can see the original post at Debug Selenium Tests: logLevel.


This tip works if you’re targeting:


Change logLevel in tests/selenium/wdio.conf.js from the default error to info.

exports.config = {
 // Level of logging verbosity: trace | debug | info | warn | error | silent
 logLevel: 'info'

Run Selenium tests

npm run selenium-test

Output will contain a lot of useful debugging information.

[0-5] 2021-04-01T15:03:41.952Z INFO devtools: COMMAND deleteAllCookies()
[0-5] 2021-04-01T15:03:41.965Z INFO devtools: RESULT null

[0-5] 2021-04-01T15:03:42.841Z INFO devtools: COMMAND navigateTo("http://localhost:8080/w/index.php?title=Special%3AUserLogin")
[0-5] 2021-04-01T15:03:43.554Z INFO devtools: RESULT null

[0-5] 2021-04-01T15:03:43.566Z INFO devtools: COMMAND findElement("css selector", "#wpName1")
[0-5] 2021-04-01T15:03:43.571Z INFO devtools: RESULT { 'element-6066-11e4-a52e-4f735466cecf': 'ELEMENT-6' }

[0-5] 2021-04-01T15:03:43.577Z INFO devtools: COMMAND elementClear("ELEMENT-6")
[0-5] 2021-04-01T15:03:43.584Z INFO devtools: RESULT null

[0-5] 2021-04-01T15:03:43.612Z INFO devtools: COMMAND elementSendKeys("ELEMENT-6", "User-0.7731870706237638-Iñtërnâtiônàlizætiøn")
[0-5] 2021-04-01T15:03:43.730Z INFO devtools: RESULT null


[0-5] 2021-04-01T15:03:45.928Z INFO devtools: COMMAND takeScreenshot()
[0-5] 2021-04-01T15:03:46.224Z INFO devtools: RESULT iVBORw0KGgoAAAANSUhEUgAABLAAAAOECAYAAACxbcj6AAABKWlDQ1BTa2lhA...
        Screenshot location: /Users/z/Documents/gerrit/mediawiki/core/tests/selenium/log/User-should-be-able-to-log-in-%40daily.png

More information

  • MediaWiki documentation on running Selenium tests.
  • WebdriverIO loglevel documentation.
  • The code from this post is available as Gerrit patch 676397.