Re: [PATCH 1/1] t/test-lib: make `test_dir_is_empty` more robust

One caveat involves invocations of `test_must_fail test_dir_is_empty`, wherein we _don't_ actually expect the directory to be empty. It looks like there might not be any such invocations in Git, though, for what it's worth.

The solution that counts the lines of `ls -a` seems like it should be universally portable, both in POSIX and in practice, and it doesn't complicate the code at all. (I'd say that it's slightly simpler than the `egrep` approach in the status quo.) I've adjusted the patch to use Eric's version, which I like a bit more than mine; I'll send out the revised commit presently.

It's true that within Git we can simply try to avoid creating pathological file names. But Sharness is also exposed as a standalone library, and it seems clear that the public function therein should be correct in all cases. Assuming that the new implementation is sufficiently inoffensive, is there any harm in being perhaps a bit more robust than is practically needed, and also maintaining consistency with Sharness?

Thanks for all the suggestions and feedback so far!

Best, WC