From: Johannes Schindelin <Johannes.Schindelin@gmx.de>
To: Jeff King <peff@peff.net>
Cc: "Duy Nguyen" <pclouds@gmail.com>,
"Christian Couder" <christian.couder@gmail.com>,
git <git@vger.kernel.org>, "Stefan Beller" <sbeller@google.com>,
"SZEDER Gábor" <szeder.dev@gmail.com>,
"Thomas Gummerer" <t.gummerer@gmail.com>,
"Оля Тележная" <olyatelezhnaya@gmail.com>,
"Matthieu Moy" <Matthieu.Moy@gmail.com>
Subject: Re: GSoC 2019: Git's application submitted
Date: Wed, 6 Mar 2019 15:16:33 +0100 (STD) [thread overview]
Message-ID: <nycvar.QRO.7.76.6.1903061515140.41@tvgsbejvaqbjf.bet> (raw)
In-Reply-To: <20190306044955.GC6664@sigill.intra.peff.net>
Hi Peff,
On Tue, 5 Mar 2019, Jeff King wrote:
> On Tue, Mar 05, 2019 at 07:04:59PM +0700, Duy Nguyen wrote:
>
> > On Mon, Feb 4, 2019 at 4:17 PM Christian Couder
> > <christian.couder@gmail.com> wrote:
> > >
> > > Hi everyone,
> > >
> > > There are now ideas, micro-projects and organization application pages
> > > for GSoC 2019 on https://git.github.io/
> > >
> > > It would be nice to have a few more project ideas.
> >
> > Not sure if it's too late now. Anyway this could be something fun to
> > do: support C-based tests in our test suite.
> >
> > A while back I noticed some test running very long because it was
> > trying a lot of input combination. The actual logic is not much, but
> > because of the increasing number of test cases, overhead goes off the
> > roof. The last part is probably not true, but Windows port I think is
> > hit much harder than what I experience, and I think Dscho did complain
> > about it.
> >
> > So what this project does is somehow allow people to write test cases
> > in C instead of shell. Imagine replacing t3070-wildmatch.sh with a
> > binary program t3070-wildmatch that behaves the same way. This test
> > framework needs to support the same basic feature set as test-lib.sh:
> > TAP output, test results summary, maybe -i and --valgrind... To
> > demonstrate that the test framework works, one of these long test
> > files should be rewritten in C. I'm sure there's one that is simple to
> > rewrite.
> >
> > I'm pretty sure I had some fun with this idea and made some prototype
> > but I couldn't find it. If I do, I'll post the link here.
>
> In my experience, it's nicer to have a tool written in C that can be
> driven by arbitrary input. That makes it easy to write new test cases,
> because you just have to write in some easy domain-specific format
> instead of embedding the test data in C code.
>
> And many of our tests do work like that (in fact, many of the Git
> plumbing tools function as that). E.g., test-date gives you direct
> access to the low-level routines, and we feed it a variety of dates.
>
> That doesn't help with the cost of invoking that tool over and over,
> though, once per test case. I wonder if we could have some kind of
> hybrid. I.e., where t3070 is still a shell script, but it primarily
> consists of running one big binary, like:
>
> test-wildmatch <<-\EOF
> case 1
> case 2
> ...etc
> EOF
>
> but with one added twist: test-wildmatch would actually generate TAP
> output for each test, rather than just returning 0/1 for each success or
> failure, and being embedded in a test_expect_success.
>
> It seems like that would even be pretty easy to do, with the exception
> of the numbering. It would be nice if we could intermingle this kind of
> "chunk of C tests" with normal tests, but we'd have to figure out how
> many tests it ran and increment our shell-script's counter
> appropriately.
Oooooh, that sounds like a very nice idea! Eventually, we might even be
able to specify our test cases in our own, extensible language, where we
do not have to pay attention to &&-chains, or portability, because our
test runner does all that for us, under the hood, as it should be.
Dreaming of that future,
Dscho
next prev parent reply other threads:[~2019-03-06 14:16 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-04 9:16 GSoC 2019: Git's application submitted Christian Couder
[not found] ` <CAL21Bm=K6zZ=APkiP3A_X7xVoOfx-MY2435YMp5y1ztE-xyYtg@mail.gmail.com>
2019-02-04 12:54 ` Christian Couder
2019-02-04 21:52 ` Thomas Gummerer
2019-02-05 21:17 ` Thomas Gummerer
2019-02-05 22:00 ` Christian Couder
2019-02-06 22:09 ` Thomas Gummerer
2019-02-07 19:39 ` Johannes Schindelin
2019-02-07 21:33 ` Thomas Gummerer
2019-02-11 5:41 ` Оля Тележная
2019-02-11 7:45 ` Christian Couder
2019-02-11 8:31 ` Оля Тележная
2019-02-11 10:52 ` Christian Couder
2019-02-13 22:36 ` Elijah Newren
2019-02-14 9:48 ` Christian Couder
2019-02-11 8:35 ` Christian Couder
2019-02-11 22:18 ` Thomas Gummerer
2019-02-11 23:58 ` Christian Couder
2019-02-12 20:25 ` Thomas Gummerer
2019-02-12 20:49 ` Christian Couder
2019-02-12 22:13 ` Thomas Gummerer
2019-02-06 12:27 ` Johannes Schindelin
2019-03-05 12:04 ` Duy Nguyen
2019-03-05 12:23 ` Duy Nguyen
2019-03-06 4:49 ` Jeff King
2019-03-06 9:36 ` Duy Nguyen
2019-03-06 19:08 ` Jeff King
2019-03-06 14:16 ` Johannes Schindelin [this message]
2019-03-18 12:51 ` Duy Nguyen
2019-03-18 16:37 ` Christian Couder
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