From: brendanhiggins@google.com (Brendan Higgins)
Subject: [RFC v3 17/19] of: unittest: migrate tests to run on KUnit
Date: Thu, 14 Feb 2019 13:52:35 -0800 [thread overview]
Message-ID: <CAFd5g44dn-w5s4npCY-8kwj3EvqvFmMP_3SzDzNpHVjiB35fXQ@mail.gmail.com> (raw)
Message-ID: <20190214215235.3OTbXIx_FXJFRy6HAv83uKanenqlqQNlNBXR_NcxpbQ@z> (raw)
In-Reply-To: <CAL_JsqL=NthWW6q==TXjado83AAWuC1jYZ9CR+T9wPtgQLC4hw@mail.gmail.com>
On Thu, Feb 14, 2019@12:10 PM Rob Herring <robh@kernel.org> wrote:
>
> On Tue, Feb 12, 2019 at 7:44 PM Brendan Higgins
> <brendanhiggins@google.com> wrote:
> >
> > On Wed, Nov 28, 2018@12:56 PM Rob Herring <robh@kernel.org> wrote:
> > >
> > > On Wed, Nov 28, 2018 at 1:38 PM Brendan Higgins
> > > <brendanhiggins@google.com> wrote:
> > > >
> > > > Migrate tests without any cleanup, or modifying test logic in anyway to
> > > > run under KUnit using the KUnit expectation and assertion API.
> > >
> > > Nice! You beat me to it. This is probably going to conflict with what
> > > is in the DT tree for 4.21. Also, please Cc the DT list for
> > > drivers/of/ changes.
> > >
> > > Looks good to me, but a few mostly formatting comments below.
> >
> > I just realized that we never talked about your other comments, and I
> > still have some questions. (Sorry, it was the last thing I looked at
> > while getting v4 ready.) No worries if you don't get to it before I
> > send v4 out, I just didn't want you to think I was ignoring you.
> >
> > >
> > > >
> > > > Signed-off-by: Brendan Higgins <brendanhiggins at google.com>
> > > > ---
> > > > drivers/of/Kconfig | 1 +
> > > > drivers/of/unittest.c | 1405 ++++++++++++++++++++++-------------------
> > > > 2 files changed, 752 insertions(+), 654 deletions(-)
> > > >
> > <snip>
> > > > diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
> > > > index 41b49716ac75f..a5ef44730ffdb 100644
> > > > --- a/drivers/of/unittest.c
> > > > +++ b/drivers/of/unittest.c
> > <snip>
> > > > -
> > > > -static void __init of_unittest_find_node_by_name(void)
> > > > +static void of_unittest_find_node_by_name(struct kunit *test)
> > >
> > > Why do we have to drop __init everywhere? The tests run later?
> >
> > From the standpoint of a unit test __init doesn't really make any
> > sense, right? I know that right now we are running as part of a
> > kernel, but the goal should be that a unit test is not part of a
> > kernel and we just include what we need.
>
> Well, the test only runs during boot and better to free the space when
> done with it. There was some desire to make it a kernel module and
> then we'd also need to get rid of __init too.
>
> > Even so, that's the future. For now, I did not put the KUnit
> > infrastructure in the .init section because I didn't think it belonged
> > there. In practice, KUnit only knows how to run during the init phase
> > of the kernel, but I don't think it should be restricted there. You
> > should be able to run tests whenever you want because you should be
> > able to test anything right? I figured any restriction on that is
> > misleading and will potentially get in the way at worst, and
> > unnecessary at best especially since people shouldn't build a
> > production kernel with all kinds of unit tests inside.
>
> More folks will run things if they can be enabled on production
> kernels. If size is the only issue, modules mitigate that. However,
> there's probably APIs to test which we don't want to export to
> modules.
>
> I think in general, we change things in the kernel when needed, not
> for something in the future. Changing __init is simple enough to do
> later.
>
> OTOH, things get copied and maybe this we don't want copied, so we can
> remove it if you want to.
Mmmm...I just realized that the patch I sent you the other day makes
this patch unhappy because unflatten_device_tree is in the .init
section. So I will need to fix that. I still think that the correct
course of action is to make KUnit non init. Luis pointed out in
another thread that to be 100% sure that everything will be properly
initialized, KUnit must be able to run after all initialization takes
place.
>
> > <snip>
> > > >
> > > > -static void __init of_unittest_property_string(void)
> > > > +static void of_unittest_property_string(struct kunit *test)
> > > > {
> > > > const char *strings[4];
> > > > struct device_node *np;
> > > > int rc;
> > > >
> > > > np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
> > > > - if (!np) {
> > > > - pr_err("No testcase data in device tree\n");
> > > > - return;
> > > > - }
> > > > -
> > > > - rc = of_property_match_string(np, "phandle-list-names", "first");
> > > > - unittest(rc == 0, "first expected:0 got:%i\n", rc);
> > > > - rc = of_property_match_string(np, "phandle-list-names", "second");
> > > > - unittest(rc == 1, "second expected:1 got:%i\n", rc);
> > > > - rc = of_property_match_string(np, "phandle-list-names", "third");
> > > > - unittest(rc == 2, "third expected:2 got:%i\n", rc);
> > > > - rc = of_property_match_string(np, "phandle-list-names", "fourth");
> > > > - unittest(rc == -ENODATA, "unmatched string; rc=%i\n", rc);
> > > > - rc = of_property_match_string(np, "missing-property", "blah");
> > > > - unittest(rc == -EINVAL, "missing property; rc=%i\n", rc);
> > > > - rc = of_property_match_string(np, "empty-property", "blah");
> > > > - unittest(rc == -ENODATA, "empty property; rc=%i\n", rc);
> > > > - rc = of_property_match_string(np, "unterminated-string", "blah");
> > > > - unittest(rc == -EILSEQ, "unterminated string; rc=%i\n", rc);
> > > > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, np);
> > > > +
> > > > + KUNIT_EXPECT_EQ(test,
> > > > + of_property_match_string(np,
> > > > + "phandle-list-names",
> > > > + "first"),
> > > > + 0);
> > > > + KUNIT_EXPECT_EQ(test,
> > > > + of_property_match_string(np,
> > > > + "phandle-list-names",
> > > > + "second"),
> > > > + 1);
> > >
> > > Fewer lines on these would be better even if we go over 80 chars.
> >
> > On the of_property_match_string(...), I have no opinion. I will do
> > whatever you like best.
> >
> > Nevertheless, as far as the KUNIT_EXPECT_*(...), I do have an opinion: I am
> > trying to establish a good, readable convention. Given an expect statement
> > structured as
> > ```
> > KUNIT_EXPECT_*(
> > test,
> > expect_arg_0, ..., expect_arg_n,
> > fmt_str, fmt_arg_0, ..., fmt_arg_n)
> > ```
> > where `test` is the `struct kunit` context argument, `expect_arg_{0, ..., n}`
> > are the arguments the expectations is being made about (so in the above example,
> > `of_property_match_string(...)` and `1`), and `fmt_*` is the optional format
> > string that comes at the end of some expectations.
> >
> > The pattern I had been trying to promote is the following:
> >
> > 1) If everything fits on 1 line, do that.
> > 2) If you must make a line split, prefer to keep `test` on its own line,
> > `expect_arg_{0, ..., n}` should be kept together, if possible, and the format
> > string should follow the conventions already most commonly used with format
> > strings.
> > 3) If you must split up `expect_arg_{0, ..., n}` each argument should get its
> > own line and should not share a line with either `test` or any `fmt_*`.
>
> You'd better write a checkpatch.pl check or else good luck enforcing that. :)
Absolutely. Well I already had to touch checkpatch.pl for something
else, so at least I know roughly what I am getting myself into.
>
> > The reason I care about this so much is because expectations should be
> > extremely easy to read; they are the most important part of a unit
> > test because they tell you what the test is verifying. I am not
> > married to the formatting I proposed above, but I want something that
> > will be extremely easy to identify the arguments that the expectation
> > is on. Maybe that means that I need to add some syntactic fluff to
> > make it clearer, I don't know, but this is definitely something we
> > need to get right, especially in the earliest examples.
>
> Makes sense. I think putting the test (of_property_match_string) on
> one line furthers the readability.
Fair enough, I tried to apply your comments the best that I could on
v4, but I think I will probably need to make another pass (especially
given the init thing).
Anyway, let's continue the discussion on v4.
Cheers
next prev parent reply other threads:[~2019-02-14 21:52 UTC|newest]
Thread overview: 232+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-28 19:36 [RFC v3 00/19] kunit: introduce KUnit, the Linux kernel unit testing framework brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 01/19] kunit: test: add KUnit test runner core brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-30 3:14 ` mcgrof
2018-11-30 3:14 ` Luis Chamberlain
2018-12-01 1:51 ` brendanhiggins
2018-12-01 1:51 ` Brendan Higgins
2018-12-01 2:57 ` mcgrof
2018-12-01 2:57 ` Luis Chamberlain
2018-12-05 13:15 ` anton.ivanov
2018-12-05 13:15 ` Anton Ivanov
2018-12-05 14:45 ` arnd
2018-12-05 14:45 ` Arnd Bergmann
2018-12-05 14:49 ` anton.ivanov
2018-12-05 14:49 ` Anton Ivanov
2018-11-30 3:28 ` mcgrof
2018-11-30 3:28 ` Luis Chamberlain
2018-12-01 2:08 ` brendanhiggins
2018-12-01 2:08 ` Brendan Higgins
2018-12-01 3:10 ` mcgrof
2018-12-01 3:10 ` Luis Chamberlain
2018-12-03 22:47 ` brendanhiggins
2018-12-03 22:47 ` Brendan Higgins
2018-12-01 3:02 ` mcgrof
2018-12-01 3:02 ` Luis Chamberlain
2018-11-28 19:36 ` [RFC v3 02/19] kunit: test: add test resource management API brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 03/19] kunit: test: add string_stream a std::stream like string builder brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-30 3:29 ` mcgrof
2018-11-30 3:29 ` Luis Chamberlain
2018-12-01 2:14 ` brendanhiggins
2018-12-01 2:14 ` Brendan Higgins
2018-12-01 3:12 ` mcgrof
2018-12-01 3:12 ` Luis Chamberlain
2018-12-03 10:55 ` pmladek
2018-12-03 10:55 ` Petr Mladek
2018-12-04 0:35 ` brendanhiggins
2018-12-04 0:35 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 04/19] kunit: test: add test_stream a std::stream like logger brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 05/19] kunit: test: add the concept of expectations brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 06/19] arch: um: enable running kunit from User Mode Linux brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-28 21:26 ` robh
2018-11-28 21:26 ` Rob Herring
2018-11-30 3:37 ` mcgrof
2018-11-30 3:37 ` Luis Chamberlain
2018-11-30 14:05 ` robh
2018-11-30 14:05 ` Rob Herring
2018-11-30 18:22 ` mcgrof
2018-11-30 18:22 ` Luis Chamberlain
2018-12-03 23:22 ` brendanhiggins
2018-12-03 23:22 ` Brendan Higgins
2018-11-30 3:30 ` mcgrof
2018-11-30 3:30 ` Luis Chamberlain
2018-11-28 19:36 ` [RFC v3 07/19] kunit: test: add initial tests brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-30 3:40 ` mcgrof
2018-11-30 3:40 ` Luis Chamberlain
2018-12-03 23:26 ` brendanhiggins
2018-12-03 23:26 ` Brendan Higgins
2018-12-03 23:43 ` mcgrof
2018-12-03 23:43 ` Luis Chamberlain
2018-11-28 19:36 ` [RFC v3 08/19] arch: um: add shim to trap to allow installing a fault catcher for tests brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-30 3:34 ` mcgrof
2018-11-30 3:34 ` Luis Chamberlain
2018-12-03 23:34 ` brendanhiggins
2018-12-03 23:34 ` Brendan Higgins
2018-12-03 23:46 ` mcgrof
2018-12-03 23:46 ` Luis Chamberlain
2018-12-04 0:44 ` brendanhiggins
2018-12-04 0:44 ` Brendan Higgins
2018-11-30 3:41 ` mcgrof
2018-11-30 3:41 ` Luis Chamberlain
2018-12-03 23:37 ` brendanhiggins
2018-12-03 23:37 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 09/19] kunit: test: add the concept of assertions brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 10/19] kunit: test: add test managed resource tests brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 11/19] kunit: add Python libraries for handing KUnit config and kernel brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-29 13:54 ` kieran.bingham
2018-11-29 13:54 ` Kieran Bingham
2018-12-03 23:48 ` brendanhiggins
2018-12-03 23:48 ` Brendan Higgins
2018-12-04 20:47 ` mcgrof
2018-12-04 20:47 ` Luis Chamberlain
2018-12-06 12:32 ` kieran.bingham
2018-12-06 12:32 ` Kieran Bingham
2018-12-06 15:37 ` willy
2018-12-06 15:37 ` Matthew Wilcox
2018-12-07 11:30 ` kieran.bingham
2018-12-07 11:30 ` Kieran Bingham
2018-12-11 14:09 ` pmladek
2018-12-11 14:09 ` Petr Mladek
2018-12-11 14:41 ` rostedt
2018-12-11 14:41 ` Steven Rostedt
2018-12-11 17:01 ` anton.ivanov
2018-12-11 17:01 ` Anton Ivanov
2019-02-09 0:40 ` brendanhiggins
2019-02-09 0:40 ` Brendan Higgins
2018-12-07 1:05 ` mcgrof
2018-12-07 1:05 ` Luis Chamberlain
2018-12-07 18:35 ` kent.overstreet
2018-12-07 18:35 ` Kent Overstreet
2018-11-30 3:44 ` mcgrof
2018-11-30 3:44 ` Luis Chamberlain
2018-12-03 23:50 ` brendanhiggins
2018-12-03 23:50 ` Brendan Higgins
2018-12-04 20:48 ` mcgrof
2018-12-04 20:48 ` Luis Chamberlain
2018-11-28 19:36 ` [RFC v3 12/19] kunit: add KUnit wrapper script and simple output parser brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 13/19] kunit: improve output from python wrapper brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 14/19] Documentation: kunit: add documentation for KUnit brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-29 13:56 ` kieran.bingham
2018-11-29 13:56 ` Kieran Bingham
2018-11-30 3:45 ` mcgrof
2018-11-30 3:45 ` Luis Chamberlain
2018-12-03 23:53 ` brendanhiggins
2018-12-03 23:53 ` Brendan Higgins
2018-12-06 12:16 ` kieran.bingham
2018-12-06 12:16 ` Kieran Bingham
2019-02-09 0:56 ` brendanhiggins
2019-02-09 0:56 ` Brendan Higgins
2019-02-11 12:16 ` kieran.bingham
2019-02-11 12:16 ` Kieran Bingham
2019-02-12 22:10 ` brendanhiggins
2019-02-12 22:10 ` Brendan Higgins
2019-02-13 21:55 ` kieran.bingham
2019-02-13 21:55 ` Kieran Bingham
2019-02-14 0:17 ` brendanhiggins
2019-02-14 0:17 ` Brendan Higgins
2019-02-14 17:26 ` mcgrof
2019-02-14 17:26 ` Luis Chamberlain
2019-02-14 22:07 ` brendanhiggins
2019-02-14 22:07 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 15/19] MAINTAINERS: add entry for KUnit the unit testing framework brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 16/19] arch: um: make UML unflatten device tree when testing brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-11-28 21:16 ` robh
2018-11-28 21:16 ` Rob Herring
2018-12-04 0:00 ` brendanhiggins
2018-12-04 0:00 ` Brendan Higgins
2018-11-30 3:46 ` mcgrof
2018-11-30 3:46 ` Luis Chamberlain
2018-12-04 0:02 ` brendanhiggins
2018-12-04 0:02 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 17/19] of: unittest: migrate tests to run on KUnit brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
[not found] ` <CAL_Jsq+09Kx7yMBC_Jw45QGmk6U_fp4N6HOZDwYrM4tWw+_dOA@mail.gmail.com>
2018-11-30 0:39 ` rdunlap
2018-11-30 0:39 ` Randy Dunlap
2018-12-04 0:13 ` brendanhiggins
2018-12-04 0:13 ` Brendan Higgins
2018-12-04 13:40 ` robh
2018-12-04 13:40 ` Rob Herring
2018-12-05 23:42 ` brendanhiggins
2018-12-05 23:42 ` Brendan Higgins
2018-12-07 0:41 ` robh
2018-12-07 0:41 ` Rob Herring
2018-12-04 0:08 ` brendanhiggins
2018-12-04 0:08 ` Brendan Higgins
2019-02-13 1:44 ` brendanhiggins
2019-02-13 1:44 ` Brendan Higgins
2019-02-14 20:10 ` robh
2019-02-14 20:10 ` Rob Herring
2019-02-14 21:52 ` brendanhiggins [this message]
2019-02-14 21:52 ` Brendan Higgins
2019-02-18 22:56 ` frowand.list
2019-02-18 22:56 ` Frank Rowand
2019-02-28 0:29 ` brendanhiggins
2019-02-28 0:29 ` Brendan Higgins
2018-12-04 10:56 ` frowand.list
2018-12-04 10:56 ` Frank Rowand
2018-11-28 19:36 ` [RFC v3 18/19] of: unittest: split out a couple of test cases from unittest brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-12-04 10:58 ` frowand.list
2018-12-04 10:58 ` Frank Rowand
2018-12-05 23:54 ` brendanhiggins
2018-12-05 23:54 ` Brendan Higgins
2019-02-14 23:57 ` frowand.list
2019-02-14 23:57 ` Frank Rowand
2019-02-15 0:56 ` brendanhiggins
2019-02-15 0:56 ` Brendan Higgins
2019-02-15 2:05 ` frowand.list
2019-02-15 2:05 ` Frank Rowand
2019-02-15 10:56 ` brendanhiggins
2019-02-15 10:56 ` Brendan Higgins
2019-02-18 22:25 ` frowand.list
2019-02-18 22:25 ` Frank Rowand
2019-02-20 20:44 ` frowand.list
2019-02-20 20:44 ` Frank Rowand
2019-02-20 20:47 ` frowand.list
2019-02-20 20:47 ` Frank Rowand
2019-02-28 3:52 ` brendanhiggins
2019-02-28 3:52 ` Brendan Higgins
2019-03-22 0:22 ` frowand.list
2019-03-22 0:22 ` Frank Rowand
2019-03-22 1:30 ` brendanhiggins
2019-03-22 1:30 ` Brendan Higgins
2019-03-22 1:47 ` frowand.list
2019-03-22 1:47 ` Frank Rowand
2019-03-25 22:15 ` brendanhiggins
2019-03-25 22:15 ` Brendan Higgins
2019-09-20 16:57 ` Rob Herring
2019-09-21 23:57 ` Frank Rowand
2019-03-22 1:34 ` frowand.list
2019-03-22 1:34 ` Frank Rowand
2019-03-25 22:18 ` brendanhiggins
2019-03-25 22:18 ` Brendan Higgins
2018-11-28 19:36 ` [RFC v3 19/19] of: unittest: split up some super large test cases brendanhiggins
2018-11-28 19:36 ` Brendan Higgins
2018-12-04 10:52 ` [RFC v3 00/19] kunit: introduce KUnit, the Linux kernel unit testing framework frowand.list
2018-12-04 10:52 ` Frank Rowand
2018-12-04 11:40 ` frowand.list
2018-12-04 11:40 ` Frank Rowand
2018-12-04 13:49 ` robh
2018-12-04 13:49 ` Rob Herring
2018-12-05 23:10 ` brendanhiggins
2018-12-05 23:10 ` Brendan Higgins
2019-03-22 0:27 ` frowand.list
2019-03-22 0:27 ` Frank Rowand
2019-03-25 22:04 ` brendanhiggins
2019-03-25 22:04 ` Brendan Higgins
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