As I see it, what might be more desireable than a straight shallow feature test or feature support reporting feature would be an official versioned test library, possibly including tests of pure internals, and a new standard api for asking the engine for the results it gets for running a certain test or set of tests. The engine could then either have its results collected at build time and cashed results for that particular build built into the api, or allow the user to require the result of getting the test and executing it live, with the issues that comes with that. One possible result, except the obvious success and fail, is of course that a certain test didn't exist at the time of the build and thus not tested.
Of course, the earliest something like that could be in the language would be ECMAScript 7...
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