Thanks for the update. I still can’t imagine listening to a test pattern for three minutes... :-)
You won’t be.
“Participating stations” have a script, likely to be read 3 times by an announcer at the activating authority (FEMA?), announcing it’s a test.
“Non-Participating stations” also have a script, but it’ll be read by a local announcer, repeated once, and then the station will go silent BUT NOT OFF THE AIR until the end of the test. This is for radio stations only, AFAIK, and I’m still unclear as to what a “non-participating station” is.