Re: [PATCH v3 4/7] kunit: kunit-test: Test logging a line that exactly fills a fragment

[Richard Fitzgerald]

On 9/8/23 22:22, Rae Moar wrote:
> On Wed, Aug 9, 2023 at 11:54 AM Richard Fitzgerald
> <rf@xxxxxxxxxxxxxxxxxxxxx> wrote:
> > If a log string is the exact length of a log fragment buffer
> > kunit_log_append() should now exactly fill that fragment without
> > extending the log.
> >
> > Signed-off-by: Richard Fitzgerald <rf@xxxxxxxxxxxxxxxxxxxxx>
>
> Hello!
>
> This test looks good to me. I have tested it and it seems to be working well.
>
> I appreciate all of the assert and expect statements. I do have one
> comment below.
>
> Although, I would be happy to set this as reviewed by me after that
> comment is responded to.
>
> Thanks!
> -Rae
>
> > ---
> >   lib/kunit/kunit-test.c | 37 +++++++++++++++++++++++++++++++++++++
> >   1 file changed, 37 insertions(+)
> >
> > diff --git a/lib/kunit/kunit-test.c b/lib/kunit/kunit-test.c
> > index c0ee33a8031e..9ac81828d018 100644
> > --- a/lib/kunit/kunit-test.c
> > +++ b/lib/kunit/kunit-test.c
> > @@ -763,12 +763,49 @@ static void kunit_log_extend_test_2(struct kunit *test)
> >   #endif
> >   }
> >
> > +static void kunit_log_frag_sized_line_test(struct kunit *test)
> > +{
> > +#ifdef CONFIG_KUNIT_DEBUGFS
> > +       struct kunit_suite suite;
> > +       struct kunit_log_frag *frag, *src;
> > +
> > +       suite.log = kunit_kzalloc(test, sizeof(*suite.log), GFP_KERNEL);
> > +       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, suite.log);
> > +       INIT_LIST_HEAD(suite.log);
> > +       frag = kunit_kzalloc(test, sizeof(*frag), GFP_KERNEL);
> > +       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, frag);
> > +       kunit_init_log_frag(frag);
> > +       list_add_tail(&frag->list, suite.log);
> > +
> > +       src = kunit_kzalloc(test, sizeof(*src), GFP_KERNEL);
> > +       KUNIT_ASSERT_NOT_ERR_OR_NULL(test, src);
> > +       memset(src->buf, 'x', sizeof(src->buf) - 2);
> > +       KUNIT_ASSERT_EQ(test, strlen(src->buf), sizeof(src->buf) - 2);
>
> Should this be an EXPECT instead? It doesn't seem like the test needs
> to fail immediately if this fails. Let me know what you think.

I think ASSERT is appropriate here. This isn't testing anything
(unless you don't trust memset). It's ensuring that the test data
I generate is what I expect otherwise the following testing is
invalid.

This is redundant because the first 3 lines must produce the expected
string, but I put it in to prove to myself that I can do math and
decided to leave it in.