When we were in the single rider line for Test Track they also announced it over a loud speaker that if you are in the single rider line the group will be broken up. The first time we stood in the regular line it said 45 min wait. That was after Test Track being down for 3 hours because of rain. We were in line for over 2 hours. Never again. Its single rider line or FP line.
A funny thing happened to us in April. We were in Fast pass lane and when they escort you to the little room to watch the Guy and his assistant set-up your test schedule, a woman urge her husband to block the door so no one gets in front of their group. I can still hear her voice "Honey, they are trying to get in front of us", We've been on the ride bunches of times we know the words by heart, we let others that have never seen it get a better view. If we could bypass that part we would. The husband was embarrassed but Wifey held her ground. No one got in front of her group. We were behind them, They led them to the first 2 cars (10 in her group) We were led to the 4th car which was boarding at that time. As we (in a car) passed her standing in line, we waved. LOL We enjoy that a lot. We are so bad.

I should have taken a pic of her. Her look was priceless.