for what its worth, at my last company once a candidate passed phone screening we would tell them that the in-person interview would include a one-hour coding assignment, and that they should tell us their preferred language and (free) editor/ide and we'd set it up. we also provided full access to google, and the tasks were reasonably easy (e.g. print out numbers in a square spiral, implement a duplicate file finder, that sort of thing). a depressingly vast majority still couldn't do it; contrariwise the good ones would have just as happily done it all on a whiteboard.