Longer trips are only part of the story.
I make sure that I test drive everything under all sorts of conditions. Most shops only test drive during the day, and only for a few miles, because that's when they're open for business. I test drive at night when things such as lights, windshield washers, heater, wipers, and blower motor could be needed. What I'm trying to do is to use the car under real, every day, or night, driving conditions. Stop and go traffic, high speed, loafing around town, panic stops - the whole nine yards.
When you get it back, everything works, or you know what isn't working. No blower motor or working heater - don't drive it at night in the rain.