(from msg202657 in issue 18864)

A bunch of importlib (and other?) tests make direct calls to find_module(), find_loader(), or load_module().  These are still working, as expected.  However, we should probably either replace them or supplement them with equivalent tests that make use of specs directly.

New tests please - we want to make sure these keep working unless/until we reach agreement to actually remove them, and I'd prefer not to raise any new barriers to migration from Python 2.6/7 until 3.6 at the earliest :)

Agreed. :)

Here's a patch.  In most spots I'm left things alone.

There is a comment in the docstring for test_abc.SourceOnlyLoaderTests about reload-related tests and module_for_loader (which is deprecated now).  I'm not going to worry about that for now.

Can we have a patch review please as #18864 is dependent on this.

Should this be closed, Eric?

To echo Brett's question, should this be closed, Eric?

Could I get a quick review on this.  There shouldn't be anything surprising or controversial here.  I'm pretty confident about the patch and it's pretty low-impact so if I don't hear back in the next day or two I'll merge it.

Note: the posted patch does not apply cleanly but the difference is cosmetic.

I'll try to get to it today or tomorrow.

Patch LGTM

New changeset fceaa0dc715e by Eric Snow in branch 'default':
Issue #21099: Switch applicable importlib tests to use PEP 451 API.
https://hg.python.org/cpython/rev/fceaa0dc715e