How was VAR tested

I mentioned it on Slack yesterday, as I’d been thinking about it, but after drunkenly singing about VAR with a few thousand others, I was wondering how it was tested before going live. It must have been really extensive because of the sheer amount of money involved, and the number of people it affects. It would have been incredibly difficult to simulate the live environment and the various potential factors that would affect things. Whilst I wouldn’t have wanted to be a tester on it, I’d like to have been a fly on the wall…

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