Wow, less than a minute ;’)
It would be good if the people who believe in EMP armageddon would actually read the report on probable effects of EMP.
It is unlikely that all power would be down, or all communications would be down. In the testing that a colleague helped do with EMP (which has to be very limited and small scale), about half of cars that were running were effected, and only about a quarter of cars that were not running.
From the Iranians point of view, would you roll the dice on the survival of your nation on a weapon that you had never tested?
Think about it. EMP effects are not completely understood, so you cannot know just what will happen, and you cannot test it.