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bug#51037: [PATCH] Make `print-level` & `print-length` customizable in E

From: Lars Ingebrigtsen
Subject: bug#51037: [PATCH] Make `print-level` & `print-length` customizable in ERT batch tests
Date: Fri, 08 Oct 2021 00:04:01 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

Andy Moreton <andrewjmoreton@gmail.com> writes:

> Isn't that what ert-batch-backtrace-right-margin is for ?
>   (defcustom ert-batch-backtrace-right-margin 70
>     "Maximum length of lines in ERT backtraces in batch mode.
>   Use nil for no limit (caution: backtrace lines can be very long)."
>     :type '(choice (const :tag "No truncation" nil) integer))
> Also the TEST_BACKTRACE_LINE_LENGTH environment variable can be
> used to set it (see test/Makefile.in).

Right.  But ert will still shorten "internally" with print-length etc
before chopping the lines to 70 characters.  Here's with a longer value:

est test-ensure-list2 backtrace:
  signal(error ("(\"foo\" \"foo\" \"foo\" \"foo\" \"foo\" \"foo\" \"foo\" 
\"foo\" \"..."))
  error("%S" ("foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" 
"foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" 
"foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" 
"foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" "foo" 
  (closure (t) nil (error "%S" (make-list 100 "foo")))()

Note the "..." at the end of the foo list -- that's from print-length.

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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