Engines are broken in at the factory on a dyno. The rings are seated long before the car is put on a cargo ship and shipped around the world. With modern machining and precision the time it takes to seat the piston rings on an aluminum engine, full break in is done with one heat cycle after about 5 to 10 minutes.
As soon as a vehicle has ended it's assembly it is manually driven off the line. This is to insure the vehicle functions as intended. It is taken right over to a dyno and then runs a ramp up test sequence to break the motor in and then take it to redline. As well as component test in regards to the engine. Once this is done the vehicle is good to go and is shipped after a final inspection. You can actually see this in the video listed here: [ame="https://www.youtube.com/watch?v=El5vpA8wdAs"]The Factory Life: A Behind-the-scenes at Nissan production in Japan - YouTube[/ame]
It's a video of a Nissan production plant but the operations are similar across all manufactures. The dyno I mention you can see at the 4 minute and 8 second mark.
All this talk about what is and is not proper engine break in comes from old thinking and the Wiki article on Mechanical Run In (Break In) states such thought best:
https://en.wikipedia.org/wiki/Break-...hanical_run-in)
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People developed elaborate theories on what was needed and why, and it was hard to sift the empirical evidence in trying to test or confirm the theories. Anecdotal evidence and confirmation bias definitely played at least some part. Today engineers can confidently advise users not to put too much stock in old theories of long, elaborate break-in regimens. Some users will not give credence to the engineers and will stick to their own ideas anyway; but their careful break-in beliefs are still harmless and serve roughly like a placebo in allowing them to assure themselves that they've maximized the equipment's working lifespan through their due diligence.
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Subaru would not offer a 3 year engine warranty if they had no guarantee that you would follow the "proper" break in procedure to begin with. Its in their interest to break in an engine properly themselves then sell it to you. Then to hope you'll do it right yourself and if not then they eat the repair bill under warranty when engine issues arise.