Wrap the function to test
Wrap the function to test

... such that if `buffer` is an object, `this`
is set to the proper value when `read` is invoked.

arthurchipdean/xecmascript,tejasbubane/xecmascript,tejasbubane/xecmascript,arthurchipdean/xecmascript,exercism/xecmascript,exercism/xecmascript,MattH-be/ecmascript,MattH-be/ecmascript