Yeah hybrids are gigantic pain in the ass to work on. I've actually never done a compression test on one. Being hybrid it isn't necessarily going to start when you push the button it might be on electric. I guess you'd have to run a bunch of electric accessories first so the battery is drained then when you push the button to start at the engine should engage and you could test it that way but you're kind of playing pot luck with those hybrid cars if you have to do anything with them just sitting there in a driveway. On the other hand if you can access the front crankshaft bolt you could turn it by hand with a pry bar turn it over two or three times and see what the compression is that's doable too even though it would be a pain in the ass