Which files suffer from a complete lack of tests?

[Artur Malabarba <bruce.connor.am@gmail.com>]

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I'm trying to add some tests for features (.el source files) that are
completely devoid of them. So I welcome suggestions of elisp files that
have no tests whatsoever. I also welcome volunteers to help, of course.

Context:
Besides the fact that tests are a good idea, I think that having features
with no test file at all is measurably worse than having just one or two
tests.

When a source file has no corresponding test file, someone contributing to
it feels perfectly entitled to not create one. What's worse, even if they
did want to add a test, there's a chance they might be discouraged by this,
specially if they weren't yet sure how to implement the test.

So it is my opinion that adding tests to these unfortunate files would
provide a bit more benefit for the effort invested.

Best,
Artur

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