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bug#50629: 28.0.50; hard to debug an uncaught error with ert
From: |
Gerd Möllmann |
Subject: |
bug#50629: 28.0.50; hard to debug an uncaught error with ert |
Date: |
Sun, 28 Aug 2022 11:27:01 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (darwin) |
Ihor Radchenko <yantar92@gmail.com> writes:
> Gerd Möllmann <gerd.moellmann@gmail.com> writes:
>
>> On 22-08-27 16:29 , Lars Ingebrigtsen wrote:
>>> (args-574 (condition-case err (let ( foo)
>>> (list 42 (foo)))
>>
>> Sorry, you are right, but then the condition-case "swallows" the error.
>> Not sure what can be done about that.
>
> condition-case-unless-debug?
Well, that's a nice fretwork :-)
When I expand the er-deftest form I get something like this
(progn
(ert-set-test 'f
(record 'ert-test 'f nil
#'(lambda nil
(setq debug-on-error t)
(defalias 'foo
#'(lambda nil
(bar)))
(defalias 'bar
#'(lambda nil
(zot)))
(let*
((fn-339 #'equal)
(args-340
(condition-case err
(let
((signal-hook-function
#'ert--should-signal-hook))
(list 42
(foo)))
(error
(progn
(setq fn-339 #'signal)
(list
(car err)
(cdr err)))))))
...
Note the binding of signal-hook-function, which is missing from Lars'
expansion result, where is says
(let* ((fn-573 #'equal)
(args-574 (condition-case err (let ( foo)
(list 42 (foo)))
(error (progn
(setq fn-573 #'signal)
(list (car err) (cdr
err)))))))
I can't explain that.
Anyway, let's assume that signal-hook-function is set. and the test is
run. This is done in ert--run-test-internal. That function binds
debug-on-error to t, and debugger to a lambda invoking
ert--run-test-debugger.
When our error is signaled, ert--should-signal-hook does nothing because
the error is not one of (ert-test-failed ert-test-skipped). So
ert--run-test-debugger is not run during the original signal. Not from
the signal-hook-function, because it doesn't want to, and not otherwise
because of the condition-case.
Instead, this part of the test expansion comes into play:
(let
((value-341 'ert-form-evaluation-aborted-342))
(let
(form-description-343)
(if
(unwind-protect
(setq value-341
(apply fn-339 args-340))
Note that fn-339 has been set to signal in the condition-case. Since
debug-on-error is t, the apply in the last line calls signal and we land
in ert--run-test-debugger. The debugger than records the backtrace,
which is of course not the original backtrace.
So, what can we do?
I assume there is a good reason that the signal hook function doesn't
invoke the debugger? Or in other words, what breaks when the debugger
is always invoked, which it would with condition-case-unless-error?
(That would be when ert-fail or ert-skip are used in tests.)
I don't know.
Interestingly with condition-case-unless I get one less error with make
check:
With condition-case-unless-debug:
SUMMARY OF TEST RESULTS
-----------------------
Files examined: 445
Ran 6582 tests, 6410 results as expected, 7 unexpected, 165 skipped
5 files contained unexpected results:
lisp/subr-tests.log
lisp/ls-lisp-tests.log
lisp/emacs-lisp/ert-tests.log
lisp/emacs-lisp/edebug-tests.log
With condition-case:
SUMMARY OF TEST RESULTS
-----------------------
Files examined: 445
Ran 6582 tests, 6409 results as expected, 8 unexpected, 165 skipped
6 files contained unexpected results:
src/process-tests.log
lisp/subr-tests.log
lisp/ls-lisp-tests.log
lisp/emacs-lisp/ert-tests.log
lisp/emacs-lisp/edebug-tests.log
lisp/emacs-lisp/cl-lib-tests.log
Could others try this on their platforms/with their test suites?
>From 8154955c5ff056d60b6bcd0b4b2dd234c33f0a75 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gerd=20M=C3=B6llmann?= <gerd@gnu.org>
Date: Sun, 28 Aug 2022 11:23:00 +0200
Subject: [PATCH] Let ERT test definitions use condition-case-unless-debug
* lisp/emacs-lisp/ert.el (ert--expand-should-1): Use
condition-case-unless-debug in test expansion (bug#50629).
---
lisp/emacs-lisp/ert.el | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/lisp/emacs-lisp/ert.el b/lisp/emacs-lisp/ert.el
index 047b0069bb..a8fe14aa6d 100644
--- a/lisp/emacs-lisp/ert.el
+++ b/lisp/emacs-lisp/ert.el
@@ -319,7 +319,9 @@ ert--expand-should-1
(value (gensym "value-"))
(default-value (gensym "ert-form-evaluation-aborted-")))
`(let* ((,fn (function ,fn-name))
- (,args (condition-case err
+ ;; Use condition-case-unless-debug to let the debugger record
+ ;; the original backtrace when a signal occurs.
+ (,args (condition-case-unless-debug err
(let ((signal-hook-function
#'ert--should-signal-hook))
(list ,@arg-forms))
(error (progn (setq ,fn #'signal)
--
2.37.2
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, (continued)
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Gerd Möllmann, 2022/08/26
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Lars Ingebrigtsen, 2022/08/27
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Gerd Möllmann, 2022/08/27
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Lars Ingebrigtsen, 2022/08/27
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Gerd Möllmann, 2022/08/27
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Lars Ingebrigtsen, 2022/08/27
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Mike Kupfer, 2022/08/27
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Lars Ingebrigtsen, 2022/08/27
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Gerd Möllmann, 2022/08/27
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Ihor Radchenko, 2022/08/27
- bug#50629: 28.0.50; hard to debug an uncaught error with ert,
Gerd Möllmann <=
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Lars Ingebrigtsen, 2022/08/28
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Gerd Möllmann, 2022/08/28
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Gerd Möllmann, 2022/08/28
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Gerd Möllmann, 2022/08/28
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Lars Ingebrigtsen, 2022/08/29
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Gerd Möllmann, 2022/08/29
- bug#50629: 28.0.50; hard to debug an uncaught error with ert, Lars Ingebrigtsen, 2022/08/29