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From: Juri Linkov <juri@linkov.net>
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Subject: Re: Need message-fn arg back in ert-run-tests-interactively
Date: Thu, 07 Sep 2023 09:22:23 +0300
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>>     (cl-letf (((symbol-function 'message)
>>                (lambda (format-string &rest args)
>>                  ...)))
>>       (ert-run-tests-interactively t))
>
> It might work, but dynamically binding the function cell of a standard
> Emacs Lisp function is very unclean.  Can wecome up with a cleaner way
> to do this job?

There is set-message-function added in Emacs 27.