I know Google run their own certifcation testing, you book an exam, they give you a login for a mock Gsuite domain and then you have to configure various things. You have a time limit and at the end you click submit and their back end checks your setup and scores you based on the how you completed each task. There is no human interaction involved, yes that means there is a risk of cheating however at the end of the day most people undertake training for their own personal development. At the end of the day I employ someone based on their practical skills rather than their qualifications. Sure some people will try and take advantage of this however this is where provisional periods work. Just because someone has a drivers license doesn't mean they know how to drive. Thats just my two cents.
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