linux-kernel - Re: [PATCH v2] Documentation: KUnit: Update filename best practices

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Message-ID: <CANpmjNMzNLBmUa4VgEEibmmD3fS6ZwOjq2tKxmR_H=45PaaJtA@mail.gmail.com>
Date: Tue, 23 Jul 2024 08:25:14 +0200
From: Marco Elver <elver@...gle.com>
To: John Hubbard <jhubbard@...dia.com>
Cc: Kees Cook <kees@...nel.org>, David Gow <davidgow@...gle.com>, 
	Brendan Higgins <brendan.higgins@...ux.dev>, Rae Moar <rmoar@...gle.com>, 
	Jonathan Corbet <corbet@....net>, Linus Torvalds <torvalds@...ux-foundation.org>, 
	linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] Documentation: KUnit: Update filename best practices

On Tue, 23 Jul 2024 at 01:49, John Hubbard <jhubbard@...dia.com> wrote:
>
> On 7/22/24 2:55 AM, Marco Elver wrote:
> > On Sat, Jul 20, 2024 at 09:54AM -0700, Kees Cook wrote:
> ...
> > I'm more confused now. This is just moving tests further away from what
> > they are testing for no good reason. If there's a directory "foo", then
> > moving things to "tests/foo" is unclear. It's unclear if "tests" is
> > inside parent of "foo" or actually a subdir of "foo". Per the paragraph
> > above, I inferred it's "foo/tests/foo/...", which is horrible. If it's
> > "../tests/foo/..." it's also bad because it's just moving tests further
> > away from what they are testing.
> >
> > And keeping tests close to the source files under test is generally
> > considered good practice, as it avoids the friction required to discover
> > where tests live. Moving tests to "../tests" or "../../*/tests" in the
> > majority of cases is counterproductive.
> >
> > It is more important for people to quickly discover tests nearby and
> > actually run them, vs. having them stashed away somewhere so they don't
> > bother us.
> >
> > While we can apply common sense, all too often someone follows these
> > rules blindly and we end up with a mess.
> >
>
> Here, you've actually made a good argument for "blindly" following the
> new naming/location conventions: it's easier to find things if a
> standard naming and location convention is in place. Especially if
> we document it. Now if only someone would post a patch with such
> documentation... :)
>
> I would add that the "_kunit" part of the name is especially helpful,
> because (as I mentioned earlier) these tests really are different enough
> that it's worth calling out. You can run them simply by loading the
> kernel module.
>
> So if I want to quickly run kunit tests, searching for "*_kunit.c" does
> help with that.

That's fair, and I'm not too hung up about _test vs _kunit. But that's
only a tiny change of the new rules, and not the main thing I pointed
out. My main point above was about the suboptimal guidance about
where/when to introduce the "tests" subdirectory.

Thanks,
-- Marco