bug#43792: [PATCH] Add ert macros to get resource file names

[Lars Ingebrigtsen]

Stefan Kangas <stefan@marxist.se> writes:

> There's a lot of repetitive code to get at the resource directories for
> tests.  That's obviously boring, so I'd propose something like the
> following two macros to make it easier:
>
> (ert-resource-directory)
> (ert-resource-file NAME)
>
> Please see the attached patch, the second of which uses the macros in
> our test suite.  Not sure if they should be in ert.el, so I put them in
> ert-x.el for now to play it safe.

Looks good to me.

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