[docs] [issue25768] compileall functions do not document or test return values

[Brett Cannon]

Brett Cannon added the comment:

Do the tests take much longer with all of the added stuff in setUp()/tearDown()? It's just that all of it has to run for all tests. You could make a mixin or put all of it in a method that you selectively call and which registers the proper cleanup method.

As for skip_curdir, if you look at https://hg.python.org/cpython/file/default/Lib/compileall.py#l188 you will notice it requires the current directory to be on sys.path and I don't see you make any such change to sys.path (and if you do you can use test_importlib.util.import_state to temporarily mutate sys.path (https://hg.python.org/cpython/file/default/Lib/test/test_importlib/util.py#l165).

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