Yes, in a manner of speaking; physical or virtual lab. At googles scale it wouldn't be unreasonable to have a completely parallel, but scaled back, network where they test their automation and code for happy and sad path.
That doesn't mean that bugs can't creep in. Who knows, maybe these were all extremely unlikely bugs and Google hit an astronomically unlikely bad-luck streak. Happens.
That doesn't mean that bugs can't creep in. Who knows, maybe these were all extremely unlikely bugs and Google hit an astronomically unlikely bad-luck streak. Happens.