GNU bug report logs - #66782
29.1; ERT tests reports test redefined depending on loading sequence

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Xiyue Deng <manphiz <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.1; ERT tests reports test redefined depending on loading sequence
Date: Fri, 27 Oct 2023 13:59:07 -0700

ERT may report error of `Test 'foo' redefined' when `foo' is not
actually reused but due to loading sequence of the test source files,
e.g. when some test A requires some other test B and A is loaded before
B.  A minimum test case with two ert test files:

,----
| $ cat ert-1-test.el 
| (require 'ert)
| 
| (ert-deftest first-test ()
|   (should (= (+ 1 2) 3)))
| 
| (provide 'ert-1-test)
`----

,----
| $ cat ert-2-test.el 
| (require 'ert)
| (require 'ert-1-test)
| 
| (ert-deftest second-test ()
|   (should (= (+ 2 3) 5)))
`----

If running ert by first loading ert-1-test and then ert-2-test then it
goes fine:

,----
| $ emacs -batch -Q -L . -l ert -l ert-1-test.el -l ert-2-test.el -f ert-run-tests-batch-and-exit
| Running 2 tests (2023-10-27 03:42:24-0700, selector ‘t’)
|    passed  1/2  first-test (0.000054 sec)
|    passed  2/2  second-test (0.000025 sec)
| 
| Ran 2 tests, 2 results as expected, 0 unexpected (2023-10-27 03:42:24-0700, 0.000204 sec)
`----

However, if the sequence is changed, ERT will report error:

,----
| $ emacs -batch -Q -L . -l ert -l ert-2-test.el -l ert-1-test.el -f ert-run-tests-batch-and-exit
| 
| Error: error ("Test ‘first-test’ redefined")
|   mapbacktrace(#f(compiled-function (evald func args flags) #<bytecode 0x1cdb26547dae8645>))
|   debug-early-backtrace()
|   debug-early(error (error "Test ‘first-test’ redefined"))
|   error("Test `%s' redefined" first-test)
|   ert-set-test(first-test #s(ert-test :name first-test :documentation nil :body (lambda nil (let* ((fn-10 #'=) (args-11 (condition-case err (let ((signal-hook-function #'ert--should-signal-hook)) (list (+ 1 2) 3)) (error (progn (setq fn-10 #'signal) (list (car err) (cdr err))))))) (let ((value-12 'ert-form-evaluation-aborted-13)) (let (form-description-14) (if (unwind-protect (setq value-12 (apply fn-10 args-11)) (setq form-description-14 (nconc (list '(should (= (+ 1 2) 3))) (list :form (cons fn-10 args-11)) (if (eql value-12 'ert-form-evaluation-aborted-13) nil (list :value value-12)) (if (eql value-12 'ert-form-evaluation-aborted-13) nil (let* ((-explainer- (and t (ert--get-explainer '=)))) (if -explainer- (list :explanation (apply -explainer- args-11)) nil))))) (ert--signal-should-execution form-description-14)) nil (ert-fail form-description-14))) value-12))) :most-recent-result nil :expected-result-type :passed :tags nil :file-name "/home/xiyueden/Projects/test/ert-test/ert-1-test.el"))
|   load-with-code-conversion("/home/xiyueden/Projects/test/ert-test/ert-1-test.el" "/home/xiyueden/Projects/test/ert-test/ert-1-test.el" nil t)
|   command-line-1(("-L" "." "-l" "ert" "-l" "ert-2-test.el" "-l" "ert-1-test.el" "-f" "ert-run-tests-batch-and-exit"))
|   command-line()
|   normal-top-level()
| Test ‘first-test’ redefined
`----

As you can see there's only one `first-test' defined.  The error message
is misleading.

A real world example of this can be found in lsp-mode, where
test/lsp-clangd-test.el[1] requires test/lsp-integration-test.el[2].
See also the discussion on an Debian bug[3].

This used to work fine but not after Emacs 29 started checking for used
test names.  A guess of the cause is that if the depending test is
loaded first, the dependent test will first get processed through
require and then processed again through `-l'.  Fixing this may require
a topological sorting of the libraries loaded through `-l' based on
their dependency graph.

However, I'd like to see whether upstream considers this type of usage
well-formed and should be supported.  If not, upstream should give a
warning on such usage, such as printing a warning when requiring other
modules that has `ert-deftest'.  Meanwhile, an improved error message
would also be great.

[1] https://github.com/emacs-lsp/lsp-mode/blob/master/test/lsp-clangd-test.el#L26
[2] https://github.com/emacs-lsp/lsp-mode/blob/master/test/lsp-integration-test.el#L674
[3] https://bugs.debian.org/1054494


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Message #8 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Xiyue Deng <manphiz <at> gmail.com>, Mattias Engdegård
 <mattiase <at> acm.org>
Cc: 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1;
 ERT tests reports test redefined depending on loading sequence
Date: Sat, 28 Oct 2023 09:32:43 +0300

> From: Xiyue Deng <manphiz <at> gmail.com>
> Date: Fri, 27 Oct 2023 13:59:07 -0700
> 
> As you can see there's only one `first-test' defined.  The error message
> is misleading.
> 
> A real world example of this can be found in lsp-mode, where
> test/lsp-clangd-test.el[1] requires test/lsp-integration-test.el[2].
> See also the discussion on an Debian bug[3].

If test2 requires test1, why are both of them explicitly run from the
command line?  Isn't that redundant, since running test2 will also run
the tests defined by test1?

> However, I'd like to see whether upstream considers this type of usage
> well-formed and should be supported.  If not, upstream should give a
> warning on such usage, such as printing a warning when requiring other
> modules that has `ert-deftest'.  Meanwhile, an improved error message
> would also be great.

I could agree to improving the error message, but I don't see why we
should do anything beyond that, FWIW.

Adding Mattias, who added this check 2 years ago.

Message #11 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Xiyue Deng <manphiz <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Mattias Engdegård <mattiase <at> acm.org>,
 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Sat, 28 Oct 2023 02:39:46 -0700

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Xiyue Deng <manphiz <at> gmail.com>
>> Date: Fri, 27 Oct 2023 13:59:07 -0700
>> 
>> As you can see there's only one `first-test' defined.  The error message
>> is misleading.
>> 
>> A real world example of this can be found in lsp-mode, where
>> test/lsp-clangd-test.el[1] requires test/lsp-integration-test.el[2].
>> See also the discussion on an Debian bug[3].
>
> If test2 requires test1, why are both of them explicitly run from the
> command line?  Isn't that redundant, since running test2 will also run
> the tests defined by test1?
>

IIUC most projects just run all tests without explicit dependency
detection.  For example, in lsp-mode it uses eask ert-runner to run all
tests[1].  In Debian it doesn't support cask or eask, so it also has a
custom script that detects all test files and loads them all to run
under ert[2].  In those cases the loading sequence of the test files is
random.  I think few projects actually check for such dependency, which
is not worth the trouble when the test file count is large.

On the other hand, such use is pretty rare if not wrong.  As in the case
of lsp-mode, lsp-clangd-test actually just requires lsp-integration-test
just for a macro, which could have been defined elsewhere in a helper
module and be required from both tests and the problem would be solved.

As an alternative exists, I wonder whether upstream may consider
requiring a file containing ert tests a misuse in ert tests and should
be discouraged, as it may lead to unexpected side effects depending on
loading sequence.

>> However, I'd like to see whether upstream considers this type of usage
>> well-formed and should be supported.  If not, upstream should give a
>> warning on such usage, such as printing a warning when requiring other
>> modules that has `ert-deftest'.  Meanwhile, an improved error message
>> would also be great.
>
> I could agree to improving the error message, but I don't see why we
> should do anything beyond that, FWIW.
>

This would also be better.

> Adding Mattias, who added this check 2 years ago.


[1] https://github.com/emacs-lsp/lsp-mode/blob/master/Makefile#L42
[2] https://salsa.debian.org/emacsen-team/dh-elpa/-/blob/master/dh_elpa_test#L386-396
-- 
Xiyue Deng

Message #14 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Xiyue Deng <manphiz <at> gmail.com>
Cc: mattiase <at> acm.org, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Sat, 28 Oct 2023 12:48:34 +0300

> From: Xiyue Deng <manphiz <at> gmail.com>
> Cc: Mattias Engdegård <mattiase <at> acm.org>,
>   66782 <at> debbugs.gnu.org
> Date: Sat, 28 Oct 2023 02:39:46 -0700
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > If test2 requires test1, why are both of them explicitly run from the
> > command line?  Isn't that redundant, since running test2 will also run
> > the tests defined by test1?
> 
> IIUC most projects just run all tests without explicit dependency
> detection.  For example, in lsp-mode it uses eask ert-runner to run all
> tests[1].

OK, but why do that in a single Emacs session?  That is unclean for
much more important reasons: some left-overs from previous tests could
affect the following tests.  IMO, each test should be run in a fresh
Emacs session, i.e. no command line should ever load more than a
single test file.

Message #17 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Xiyue Deng <manphiz <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: mattiase <at> acm.org, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Sat, 28 Oct 2023 04:14:15 -0700

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Xiyue Deng <manphiz <at> gmail.com>
>> Cc: Mattias Engdegård <mattiase <at> acm.org>,
>>   66782 <at> debbugs.gnu.org
>> Date: Sat, 28 Oct 2023 02:39:46 -0700
>> 
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>> 
>> > If test2 requires test1, why are both of them explicitly run from the
>> > command line?  Isn't that redundant, since running test2 will also run
>> > the tests defined by test1?
>> 
>> IIUC most projects just run all tests without explicit dependency
>> detection.  For example, in lsp-mode it uses eask ert-runner to run all
>> tests[1].
>
> OK, but why do that in a single Emacs session?  That is unclean for
> much more important reasons: some left-overs from previous tests could
> affect the following tests.  IMO, each test should be run in a fresh
> Emacs session, i.e. no command line should ever load more than a
> single test file.

I think one reason is that doing all test in one session gives you a
nice summary of how many tests passed and which ones failed in the end.
If you run just one test per session you'll have to inspect the results
manually which could be much more time consuming for large test suites,
and plus it may be slower.

-- 
Xiyue Deng

Message #20 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Xiyue Deng <manphiz <at> gmail.com>
Cc: mattiase <at> acm.org, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Sat, 28 Oct 2023 14:34:53 +0300

> From: Xiyue Deng <manphiz <at> gmail.com>
> Cc: mattiase <at> acm.org,  66782 <at> debbugs.gnu.org
> Date: Sat, 28 Oct 2023 04:14:15 -0700
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > OK, but why do that in a single Emacs session?  That is unclean for
> > much more important reasons: some left-overs from previous tests could
> > affect the following tests.  IMO, each test should be run in a fresh
> > Emacs session, i.e. no command line should ever load more than a
> > single test file.
> 
> I think one reason is that doing all test in one session gives you a
> nice summary of how many tests passed and which ones failed in the end.
> If you run just one test per session you'll have to inspect the results
> manually which could be much more time consuming for large test suites,
> and plus it may be slower.

The usual way of doing this is to generate summary by some shell
script, which runs all the tests one by one.  Emacs is not the only
program that can count ;-)

Message #23 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Xiyue Deng <manphiz <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: mattiase <at> acm.org, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Sat, 28 Oct 2023 04:50:37 -0700

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Xiyue Deng <manphiz <at> gmail.com>
>> Cc: mattiase <at> acm.org,  66782 <at> debbugs.gnu.org
>> Date: Sat, 28 Oct 2023 04:14:15 -0700
>> 
>> Eli Zaretskii <eliz <at> gnu.org> writes:
>> 
>> > OK, but why do that in a single Emacs session?  That is unclean for
>> > much more important reasons: some left-overs from previous tests could
>> > affect the following tests.  IMO, each test should be run in a fresh
>> > Emacs session, i.e. no command line should ever load more than a
>> > single test file.
>> 
>> I think one reason is that doing all test in one session gives you a
>> nice summary of how many tests passed and which ones failed in the end.
>> If you run just one test per session you'll have to inspect the results
>> manually which could be much more time consuming for large test suites,
>> and plus it may be slower.
>
> The usual way of doing this is to generate summary by some shell
> script, which runs all the tests one by one.  Emacs is not the only
> program that can count ;-)
>

That also works of course, though personally I would prefer the good and
reliable `ert-summarize-tests-batch-and-exit'[1] so that I don't have to
reinvent the wheel ;-)

[1] https://www.gnu.org/software/emacs/manual/html_node/ert/Running-Tests-in-Batch-Mode.html

P.S. I also thought of another potential counter-example of preferring
running one test file over running many in one batch: the tests within
the same test file may also leave garbage for the rest of the tests, so
to avoid that we would have to prefer running one test per session (do
we have such a filter?), which may become even slower.

-- 
Xiyue Deng

Message #26 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Xiyue Deng <manphiz <at> gmail.com>
Cc: mattiase <at> acm.org, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Sat, 28 Oct 2023 15:03:47 +0300

> From: Xiyue Deng <manphiz <at> gmail.com>
> Cc: mattiase <at> acm.org,  66782 <at> debbugs.gnu.org
> Date: Sat, 28 Oct 2023 04:50:37 -0700
> 
> P.S. I also thought of another potential counter-example of preferring
> running one test file over running many in one batch: the tests within
> the same test file may also leave garbage for the rest of the tests

We could reasonably expect from the author of a single .el test file
to make sure the tests in that file don't interfere with one another
and make the necessary cleanups for that purpose.  But it is much
harder to expect the same from several disparate test files, which can
quite frequently be written and maintained by different people.

Message #29 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 66782 <at> debbugs.gnu.org, Xiyue Deng <manphiz <at> gmail.com>
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Sat, 28 Oct 2023 14:46:23 +0200

28 okt. 2023 kl. 14.03 skrev Eli Zaretskii <eliz <at> gnu.org>:

> We could reasonably expect from the author of a single .el test file
> to make sure the tests in that file don't interfere with one another
> and make the necessary cleanups for that purpose.  But it is much
> harder to expect the same from several disparate test files, which can
> quite frequently be written and maintained by different people.

I agree, and I have found this to be far from uncommon in practice.

Treating redefined test cases as errors found and still finds serious testing bugs, so we definitely want to keep the check as it is or in some equivalent form (a warning wouldn't be nearly as good).

And I also agree that the way this test runner explicitly loads .el files without any concern for whether they logically represent a single test collection or are just sub-modules for use in other tests, is quite questionable. 

I may be missing the point entirely, but what about using a file name convention like Emacs, where only *-tests.el are considered to be actual tests?

Message #32 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Xiyue Deng <manphiz <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: mattiase <at> acm.org, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Sat, 28 Oct 2023 12:41:19 -0700

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Xiyue Deng <manphiz <at> gmail.com>
>> Cc: mattiase <at> acm.org,  66782 <at> debbugs.gnu.org
>> Date: Sat, 28 Oct 2023 04:50:37 -0700
>> 
>> P.S. I also thought of another potential counter-example of preferring
>> running one test file over running many in one batch: the tests within
>> the same test file may also leave garbage for the rest of the tests
>
> We could reasonably expect from the author of a single .el test file
> to make sure the tests in that file don't interfere with one another
> and make the necessary cleanups for that purpose.  But it is much
> harder to expect the same from several disparate test files, which can
> quite frequently be written and maintained by different people.

Fair enough.  And of course ideally each test should be able to run
either independently and batched together so that running everything in
batch is possible with the nice summary :-)

-- 
Xiyue Deng

Message #35 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Xiyue Deng <manphiz <at> gmail.com>
To: Mattias Engdegård <mattias.engdegard <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Sat, 28 Oct 2023 14:19:40 -0700

Mattias Engdegård <mattias.engdegard <at> gmail.com> writes:

> 28 okt. 2023 kl. 14.03 skrev Eli Zaretskii <eliz <at> gnu.org>:
>
>> We could reasonably expect from the author of a single .el test file
>> to make sure the tests in that file don't interfere with one another
>> and make the necessary cleanups for that purpose.  But it is much
>> harder to expect the same from several disparate test files, which can
>> quite frequently be written and maintained by different people.
>
> I agree, and I have found this to be far from uncommon in practice.
>
> Treating redefined test cases as errors found and still finds serious testing
> bugs, so we definitely want to keep the check as it is or in some equivalent
> form (a warning wouldn't be nearly as good).
>

I also agree, and I would definitely keep the current check.  At the
very least, duplicated test name makes identifying failed tests harder.

> And I also agree that the way this test runner explicitly loads .el files
> without any concern for whether they logically represent a single test
> collection or are just sub-modules for use in other tests, is quite
> questionable.
>

Exactly.

> I may be missing the point entirely, but what about using a file name convention
> like Emacs, where only *-tests.el are considered to be actual tests?
>

Which is why I'm asking for upstream stance on whether it will consider
requiring other test modules as well-formed.  To clarify one of my
original proposals: if it makes no sense for a `ert-deftest' to depend
on other `ert-deftest', I would say there is no reason for such a
dependency, and people should move reusable components to a helper
module instead.  And of course a better error message such as forbidding
such requires would be better.

Wdyt?

>

-- 
Xiyue Deng

Message #38 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Xiyue Deng <manphiz <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Sun, 29 Oct 2023 13:09:11 +0100

28 okt. 2023 kl. 23.19 skrev Xiyue Deng <manphiz <at> gmail.com>:

> To clarify one of my
> original proposals: if it makes no sense for a `ert-deftest' to depend
> on other `ert-deftest', I would say there is no reason for such a
> dependency, and people should move reusable components to a helper
> module instead.

There is no reason for one `ert-deftest` to make use of another, but was that the case here? I interpreted it as a test suite that spread its `ert-deftest` definitions over multiple .el files which isn't necessarily a bad way of organising them.

As said before, there is little sense in including the same individual tests from multiple 'root' .el files since that would run them more than once.

Perhaps that is what you meant? If so, please forgive me for the pedantry.

Message #41 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Xiyue Deng <manphiz <at> gmail.com>
To: Mattias Engdegård <mattias.engdegard <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Sun, 29 Oct 2023 14:53:23 -0700

Mattias Engdegård <mattias.engdegard <at> gmail.com> writes:

> 28 okt. 2023 kl. 23.19 skrev Xiyue Deng <manphiz <at> gmail.com>:
>
>> To clarify one of my
>> original proposals: if it makes no sense for a `ert-deftest' to depend
>> on other `ert-deftest', I would say there is no reason for such a
>> dependency, and people should move reusable components to a helper
>> module instead.
>
> There is no reason for one `ert-deftest` to make use of another, but was that
> the case here? I interpreted it as a test suite that spread its `ert-deftest`
> definitions over multiple .el files which isn't necessarily a bad way of
> organising them.
>

As they just use eask to run all tests under folder test in their
Makefile[1], I don't think spreading definitions is what they are doing.
To clarify, I think instead they are requiring lsp-integration-test just
because they want use the `lsp-test-wait' macro[2] in
lsp-clangd-test[3][4][5], which could have been done by putting those
macros in a separate file and requiring that from both tests.

> As said before, there is little sense in including the same individual tests from multiple 'root' .el files since that would run them more than once.
>
> Perhaps that is what you meant? If so, please forgive me for the pedantry.
>

Exactly, and no worries.

As far as I know, there is no practical use for a test case to depend on
another test case in any language I worked with as a test case provides
no reusable component.  On the other hand, there are alternatives that
makes more sense to do what they (e.g. lsp-mode) are doing.  Again, IMHO
I think it makes sense for ERT not to support it or to even forbid it.
Doing this also avoids such misleading error message I was reporting,
which got triggered depending on the loading sequence which may make
test suites flaky (as the loading sequence is not deterministic).

[1] https://github.com/emacs-lsp/lsp-mode/blob/master/Makefile#L42
[2] https://github.com/emacs-lsp/lsp-mode/blob/master/test/lsp-integration-test.el#L51
[3] https://github.com/emacs-lsp/lsp-mode/blob/master/test/lsp-clangd-test.el#L109
[4] https://github.com/emacs-lsp/lsp-mode/blob/master/test/lsp-clangd-test.el#L118
[5] https://github.com/emacs-lsp/lsp-mode/blob/master/test/lsp-clangd-test.el#L141

-- 
Xiyue Deng

Message #44 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Xiyue Deng <manphiz <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Mon, 30 Oct 2023 13:04:58 +0100

29 okt. 2023 kl. 22.53 skrev Xiyue Deng <manphiz <at> gmail.com>:

> As far as I know, there is no practical use for a test case to depend on
> another test case in any language I worked with as a test case provides
> no reusable component.  On the other hand, there are alternatives that
> makes more sense to do what they (e.g. lsp-mode) are doing.  Again, IMHO
> I think it makes sense for ERT not to support it or to even forbid it.
> Doing this also avoids such misleading error message I was reporting,
> which got triggered depending on the loading sequence which may make
> test suites flaky (as the loading sequence is not deterministic).

I don't think ERT can forbid anyone from loading in the same .el file multiple times because it's none of its business. Or did you have something else in mind?

All in all, I'm not sure there is anything that we can do in Emacs right now that would help, but if you have any concrete suggestions, do tell.

Message #47 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Xiyue Deng <manphiz <at> gmail.com>
To: Mattias Engdegård <mattias.engdegard <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Mon, 30 Oct 2023 13:47:53 -0700

Mattias Engdegård <mattias.engdegard <at> gmail.com> writes:

> 29 okt. 2023 kl. 22.53 skrev Xiyue Deng <manphiz <at> gmail.com>:
>
>> As far as I know, there is no practical use for a test case to depend on
>> another test case in any language I worked with as a test case provides
>> no reusable component.  On the other hand, there are alternatives that
>> makes more sense to do what they (e.g. lsp-mode) are doing.  Again, IMHO
>> I think it makes sense for ERT not to support it or to even forbid it.
>> Doing this also avoids such misleading error message I was reporting,
>> which got triggered depending on the loading sequence which may make
>> test suites flaky (as the loading sequence is not deterministic).
>
> I don't think ERT can forbid anyone from loading in the same .el file multiple times because it's none of its business. Or did you have something else in mind?
>

It's not that loading the same .el multiple times that caused this
error, but loading a module with `ert-deftest' and both .el modules are
passed to batch ert processing which is common practice.  But see below.

> All in all, I'm not sure there is anything that we can do in Emacs right now that would help, but if you have any concrete suggestions, do tell.
>

I understand if upstream don't want to complicate `require' logic too
much.  However I wonder whether it's OK to add warning if a required
module has `ert-deftest' in it, so that it can help people identify that
a `Test "foo" redefined' error is due to requiring other module instead
of an actual duplicated test name.  How does this sound?

-- 
Xiyue Deng

Message #50 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Xiyue Deng <manphiz <at> gmail.com>
To: Mattias Engdegård <mattias.engdegard <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Thu, 02 Nov 2023 10:17:01 -0700

[Message part 1 (text/plain, inline)]

Xiyue Deng <manphiz <at> gmail.com> writes:

> Mattias Engdegård <mattias.engdegard <at> gmail.com> writes:
>
>> 29 okt. 2023 kl. 22.53 skrev Xiyue Deng <manphiz <at> gmail.com>:
>>
>>> As far as I know, there is no practical use for a test case to depend on
>>> another test case in any language I worked with as a test case provides
>>> no reusable component.  On the other hand, there are alternatives that
>>> makes more sense to do what they (e.g. lsp-mode) are doing.  Again, IMHO
>>> I think it makes sense for ERT not to support it or to even forbid it.
>>> Doing this also avoids such misleading error message I was reporting,
>>> which got triggered depending on the loading sequence which may make
>>> test suites flaky (as the loading sequence is not deterministic).
>>
>> I don't think ERT can forbid anyone from loading in the same .el file multiple times because it's none of its business. Or did you have something else in mind?
>>
>
> It's not that loading the same .el multiple times that caused this
> error, but loading a module with `ert-deftest' and both .el modules are
> passed to batch ert processing which is common practice.  But see below.
>
>> All in all, I'm not sure there is anything that we can do in Emacs right now that would help, but if you have any concrete suggestions, do tell.
>>
>
> I understand if upstream don't want to complicate `require' logic too
> much.  However I wonder whether it's OK to add warning if a required
> module has `ert-deftest' in it, so that it can help people identify that
> a `Test "foo" redefined' error is due to requiring other module instead
> of an actual duplicated test name.  How does this sound?

As I didn't get an answer I assume this was a no-go.  So instead I'd
like to propose a slight change to the error message to mention that it
may also be caused by an ert test being loaded multiple times.  Patch is
attached, please let me know whether this works.

-- 
Xiyue Deng

[0001-Revise-test-redefined-error-message.patch (text/x-diff, attachment)]

Message #53 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Xiyue Deng <manphiz <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Thu, 2 Nov 2023 19:56:41 +0100

2 nov. 2023 kl. 18.17 skrev Xiyue Deng <manphiz <at> gmail.com>:

>> I understand if upstream don't want to complicate `require' logic too
>> much.  However I wonder whether it's OK to add warning if a required
>> module has `ert-deftest' in it, so that it can help people identify that
>> a `Test "foo" redefined' error is due to requiring other module instead
>> of an actual duplicated test name.  How does this sound?
> 
> As I didn't get an answer I assume this was a no-go.

No, please don't make such an assumption -- I was just busy elsewhere and hadn't given your message the attention it deserved. Sorry about that.

That said, in this case I'm not sure how to implement your suggestion in a clean way and if all that effort is really worth the trouble, so perhaps the answer would be the same anyway. And we probably don't want to prohibit `ert-deftest` in  required modules in general for reasons mentioned -- they could be used with perfectly fine discipline elsewhere.

>  So instead I'd
> like to propose a slight change to the error message to mention that it
> may also be caused by an ert test being loaded multiple times.  Patch is
> attached, please let me know whether this works.

I wouldn't mind such a change if it really would help. Would it? Isn't it just restating the problem in other words?

Message #56 received at 66782 <at> debbugs.gnu.org (full text, mbox):

From: Xiyue Deng <manphiz <at> gmail.com>
To: Mattias Engdegård <mattias.engdegard <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 66782 <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Thu, 02 Nov 2023 15:00:23 -0700

Hi Mattias,

Mattias Engdegård <mattias.engdegard <at> gmail.com> writes:

> 2 nov. 2023 kl. 18.17 skrev Xiyue Deng <manphiz <at> gmail.com>:
>
>>> I understand if upstream don't want to complicate `require' logic too
>>> much.  However I wonder whether it's OK to add warning if a required
>>> module has `ert-deftest' in it, so that it can help people identify that
>>> a `Test "foo" redefined' error is due to requiring other module instead
>>> of an actual duplicated test name.  How does this sound?
>> 
>> As I didn't get an answer I assume this was a no-go.
>
> No, please don't make such an assumption -- I was just busy elsewhere and hadn't given your message the attention it deserved. Sorry about that.
>

Sorry if I sounded pushy which I didn't intend to, ...

> That said, in this case I'm not sure how to implement your suggestion in a clean
> way and if all that effort is really worth the trouble, so perhaps the answer
> would be the same anyway. And we probably don't want to prohibit `ert-deftest`
> in required modules in general for reasons mentioned -- they could be used with
> perfectly fine discipline elsewhere.
>

And glad we are in agreement here, as I realizing adding this extra
checking to require may add some unnecessary complexity.

>>  So instead I'd
>> like to propose a slight change to the error message to mention that it
>> may also be caused by an ert test being loaded multiple times.  Patch is
>> attached, please let me know whether this works.
>
> I wouldn't mind such a change if it really would help. Would it? Isn't it just restating the problem in other words?
>

Let me clarify my intent, which is trying to do is to distinguish the
two possible scenarios that cause this error:

1) Tests that are different but use the same test name.

2) There is no tests sharing the same name, but caused by double loading
the same test unit through a dependency by require.

Case 1 happens a lot in the wild and has caused many FTBFS bugs in
Debian after upgrading Emacs to 29.1 (e.g. [1][2]), and the fix is
simply to rename the tests.

Case 2 is kinda tricky as there are no tests actually sharing a name
here.  See also in [3], which had many test with same name as in case 1
but for the specific error on `lsp-text-document-hover-request' it's
actually case 2.  As a matter of fact I've spent a non-trivial time
trying to debug this one as it depends on the loading sequence which
caused the failure to be flaky.  So I hope my proposed change can help
people on realizing that it's case 2 a bit faster.

>

[1] https://bugs.debian.org/1052865
[2] https://bugs.debian.org/1052922
[3] https://bugs.debian.org/1052939

-- 
Xiyue Deng

Message #61 received at 66782-done <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattias.engdegard <at> gmail.com>
To: Xiyue Deng <manphiz <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 66782-done <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Fri, 3 Nov 2023 18:14:24 +0100

2 nov. 2023 kl. 23.00 skrev Xiyue Deng <manphiz <at> gmail.com>:

> 1) Tests that are different but use the same test name.
> 
> 2) There is no tests sharing the same name, but caused by double loading
> the same test unit through a dependency by require.
> 
> Case 1 happens a lot in the wild and has caused many FTBFS bugs in
> Debian after upgrading Emacs to 29.1 (e.g. [1][2]), and the fix is
> simply to rename the tests.

Thank you, I'm happy to hear that the check actually caught the kind of errors it was supposed to find.

> As a matter of fact I've spent a non-trivial time
> trying to debug this one as it depends on the loading sequence which
> caused the failure to be flaky.  So I hope my proposed change can help
> people on realizing that it's case 2 a bit faster.

That's fine, adding something like what you suggested doesn't cost us anything: now done on master (425d23fbea).

I'm closing the bug now, but do say if there is something I forgot.

Message #64 received at 66782-done <at> debbugs.gnu.org (full text, mbox):

From: Xiyue Deng <manphiz <at> gmail.com>
To: Mattias Engdegård <mattias.engdegard <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 66782-done <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Fri, 03 Nov 2023 10:56:00 -0700

Mattias Engdegård <mattias.engdegard <at> gmail.com> writes:

> 2 nov. 2023 kl. 23.00 skrev Xiyue Deng <manphiz <at> gmail.com>:
>
>> 1) Tests that are different but use the same test name.
>> 
>> 2) There is no tests sharing the same name, but caused by double loading
>> the same test unit through a dependency by require.
>> 
>> Case 1 happens a lot in the wild and has caused many FTBFS bugs in
>> Debian after upgrading Emacs to 29.1 (e.g. [1][2]), and the fix is
>> simply to rename the tests.
>
> Thank you, I'm happy to hear that the check actually caught the kind of errors it was supposed to find.
>
>> As a matter of fact I've spent a non-trivial time
>> trying to debug this one as it depends on the loading sequence which
>> caused the failure to be flaky.  So I hope my proposed change can help
>> people on realizing that it's case 2 a bit faster.
>
> That's fine, adding something like what you suggested doesn't cost us anything: now done on master (425d23fbea).
>
> I'm closing the bug now, but do say if there is something I forgot.
>

Thanks Mattias!  Would be better if this can be applied to 29 branch as
well now that 29.2 is around the corner :-)

-- 
Xiyue Deng

Message #67 received at 66782-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Xiyue Deng <manphiz <at> gmail.com>
Cc: mattias.engdegard <at> gmail.com, 66782-done <at> debbugs.gnu.org
Subject: Re: bug#66782: 29.1; ERT tests report test redefined depending on
 loading sequence
Date: Sat, 04 Nov 2023 10:51:46 +0200

> From: Xiyue Deng <manphiz <at> gmail.com>
> Cc: Eli Zaretskii <eliz <at> gnu.org>,  66782-done <at> debbugs.gnu.org
> Date: Fri, 03 Nov 2023 10:56:00 -0700
> 
> Mattias Engdegård <mattias.engdegard <at> gmail.com> writes:
> 
> > That's fine, adding something like what you suggested doesn't cost us anything: now done on master (425d23fbea).
> >
> > I'm closing the bug now, but do say if there is something I forgot.
> >
> 
> Thanks Mattias!  Would be better if this can be applied to 29 branch as
> well now that 29.2 is around the corner :-)

I cherry-picked the change to the emacs-29 branch.

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