There are some things that we are unable to verify using a browser, for example:

• captcha is rendered correctly
• video is loaded correctly

But most of the time it leaves a trace in Browser logs, for example:

        │  http://web/admin/content/download/79/ezmedia/video1.mp4 - Failed to load resource: the server responded with a status of 500 (Internal Server Error)

We should investigate whether it's possible to mark a test as failed if there is an error in application logs/browser console.