Sorry about the mishap, glad you are OK.

I have developed a set "test route" for my completed projects. It starts right in my driveway, around the corner, up a hill where I mash it pretty hard to make sure the freewheel/cassette is good (no skipping). Then I go down a flat street a ways, turn around, go down the hill, test the brakes really well (no squeaking, at least I hope not!!), then back up the driveway, into the shop, to make whatever adjustments I forgot. There is absolutely no traffic on my test route, so I am pretty free to have at it.

Finding a good test hill around here is easy. Finding a flat spot is hard....

Typically I end up needing to toe in one brake just a tad, or change a freewheel, or adjust a high/low limit on the FD just a touch. And sometimes I have it just right to begin with.

When I started flipping, I didn't do an adequate test ride, and had some embarrassing moments with potential customers. Lesson learned.