I don't have a COP tester to test the coils but I visually inspect the boots and if there is any arcing it can be seen by a small burn mark. Failing that, I attach a plug lead between coil and plug and then a timing gun to that. Start engine and watch for intermittent flashes from the timing gun. Simples!
Regards
Pete M
PS. Hope no debris has dropped down the plug hole
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