I'm not sure if they do EVERY vehicle. Nissan does, Honda does, I'm pretty sure Subaru does. Not sure about American manufacturer's, however. Usually the get a few minutes on a test track or somesuch. They may do batch testing on engines, though.
For break-in, don't use cruise control or maintain a steady speed (vary by ~5 MPH) for the first few hundred miles. Give it the boot when in 5th or 6th to help seat the piston rings. Other than that, be gentle for a little while. Check your oil every 500 for the first 5k or so (first oil change). After a few thousand miles, it'll be broken in and giving you full power- Mark W.