Yeah, don't replace any tests, add new ones for the new APIs. Given the
needs of 2/3 compatible loader implementations, the deprecations referred
to in the PEP should also be documentation-only for 3.4.

A more conservative approach also gives us a chance to make sure we have
provided a full replacement for load_module - it occurred to me after the
PEP was accepted that we may eventually need a "can_load_into(target)"
loader API after all, since loaders may not be finder specific. That means
that with the current API of passing the target to find_spec, I potentially
talked us into repeating the "load_module" mistake on the finder side of
things by asking the finder to handle more than it needed to.