bug#51941: Detect duplication of ERT tests

[Philipp Stephani]

Am Do., 18. Nov. 2021 um 18:45 Uhr schrieb Lars Ingebrigtsen <larsi@gnus.org>:
>
> By the way, this reminds me of a different error I often make in ert
> files -- I type "defun" instead of "ert-deftest".  Would it be
> productive to check whether a -tests.el file contains a defun that's
> never called?  In which case it's probably supposed to be en
> ert-deftest.
>
> But perhaps it's such a marginal problem that it's not worth checking
> for.

This also happens to me rather frequently, so I'd welcome such an
addition. The byte compiler can already generate call graphs (see
byte-compile-generate-call-tree), so maybe that functionality could be
reused.