[RFC,v2,2/9] kunit: Add speed attribute

Add speed attribute to the test attribute API. This attribute will allow
users to mark tests with a category of speed.

Currently the categories of speed proposed are: normal, slow, and very_slow
(outlined in enum kunit_speed). These are outlined in the enum kunit_speed.

The assumed default speed for tests is "normal". This indicates that the
test takes a relatively trivial amount of time (less than 1 second),
regardless of the machine it is running on. Any test slower than this could
be marked as "slow" or "very_slow".

Add the macro KUNIT_CASE_SLOW to set a test as slow, as this is likely a
common use of the attributes API.

Add an example of marking a slow test to kunit-example-test.c.

Signed-off-by: Rae Moar <rmoar@google.com>
---

Changes since v1:
- Remove the "fast" category of speed.

 include/kunit/test.h           | 30 +++++++++++++++++++++-
 lib/kunit/attributes.c         | 46 +++++++++++++++++++++++++++++++++-
 lib/kunit/kunit-example-test.c |  9 +++++++
 3 files changed, 83 insertions(+), 2 deletions(-)

On Tue, Jul 18, 2023 at 3:39 AM David Gow <davidgow@google.com> wrote:
>
> On Sat, 8 Jul 2023 at 05:09, Rae Moar <rmoar@google.com> wrote:
> >
> > Add speed attribute to the test attribute API. This attribute will allow
> > users to mark tests with a category of speed.
> >
> > Currently the categories of speed proposed are: normal, slow, and very_slow
> > (outlined in enum kunit_speed). These are outlined in the enum kunit_speed.
> >
> > The assumed default speed for tests is "normal". This indicates that the
> > test takes a relatively trivial amount of time (less than 1 second),
> > regardless of the machine it is running on. Any test slower than this could
> > be marked as "slow" or "very_slow".
> >
> > Add the macro KUNIT_CASE_SLOW to set a test as slow, as this is likely a
> > common use of the attributes API.
> >
> > Add an example of marking a slow test to kunit-example-test.c.
> >
> > Signed-off-by: Rae Moar <rmoar@google.com>
> > ---
>
> Looks good.
>
> Reviewed-by: David Gow <davidgow@google.com>
>

Thanks!

> >
> > Changes since v1:
> > - Remove the "fast" category of speed.
> >
> >  include/kunit/test.h           | 30 +++++++++++++++++++++-
> >  lib/kunit/attributes.c         | 46 +++++++++++++++++++++++++++++++++-
> >  lib/kunit/kunit-example-test.c |  9 +++++++
> >  3 files changed, 83 insertions(+), 2 deletions(-)
> >
> > diff --git a/include/kunit/test.h b/include/kunit/test.h
> > index 1fc9155988e9..c255c98a58f7 100644
> > --- a/include/kunit/test.h
> > +++ b/include/kunit/test.h
> > @@ -63,8 +63,25 @@ enum kunit_status {
> >         KUNIT_SKIPPED,
> >  };
> >
> > +/* Attribute struct/enum definitions */
> > +
> > +/*
> > + * Speed Attribute is stored as an enum and separated into categories of
> > + * speed: very_slowm, slow, normal, and fast. These speeds are relative
>
> Nit: we only have very_slow, slow & normal now.
>

Oops thanks for catching this. Will fix this before I send out the
official patch set.

> > + * to other KUnit tests.
> > + */
> > +enum kunit_speed {
> > +       KUNIT_SPEED_UNSET,
> > +       KUNIT_SPEED_VERY_SLOW,
> > +       KUNIT_SPEED_SLOW,
> > +       KUNIT_SPEED_NORMAL,
> > +       KUNIT_SPEED_MAX = KUNIT_SPEED_NORMAL,
> > +};
>
> A part of me feels that we could get away with reversing the order of
> this and having KUNIT_SPEED_NORMAL == 0. (Possibly reversing the
> comparisons in the filtering, too.)
>
> That's probably not worth the added complexity though. Either way,
> maybe add a note that "UNSET" == "NORMAL".
>
>

Yes, I definitely have been debating this order myself as well. This
order makes slightly more sense to me so I will likely keep this for
the next version but I will add that note. If there are more comments
on this, I am definitely open to reversing the order.

> > +
> >  /* Holds attributes for each test case and suite */
> > -struct kunit_attributes {};
> > +struct kunit_attributes {
> > +       enum kunit_speed speed;
> > +};
> >
> >  /**
> >   * struct kunit_case - represents an individual test case.
> > @@ -150,6 +167,17 @@ static inline char *kunit_status_to_ok_not_ok(enum kunit_status status)
> >                 { .run_case = test_name, .name = #test_name,    \
> >                   .attr = attributes }
> >
> > +/**
> > + * KUNIT_CASE_SLOW - A helper for creating a &struct kunit_case
> > + * with the slow attribute
> > + *
> > + * @test_name: a reference to a test case function.
> > + */
> > +
> > +#define KUNIT_CASE_SLOW(test_name)                     \
> > +               { .run_case = test_name, .name = #test_name,    \
> > +                 .attr.speed = KUNIT_SPEED_SLOW }
> > +
> >  /**
> >   * KUNIT_CASE_PARAM - A helper for creation a parameterized &struct kunit_case
> >   *
> > diff --git a/lib/kunit/attributes.c b/lib/kunit/attributes.c
> > index 9bda5a5f4030..e97096dbb3b1 100644
> > --- a/lib/kunit/attributes.c
> > +++ b/lib/kunit/attributes.c
> > @@ -40,9 +40,53 @@ struct kunit_attr {
> >         enum print_ops print;
> >  };
> >
> > +/* String Lists for enum Attributes */
> > +
> > +static const char * const speed_str_list[] = {"unset", "very_slow", "slow", "normal"};
> > +
> > +/* To String Methods */
> > +
> > +static const char *attr_enum_to_string(void *attr, const char * const str_list[], bool *to_free)
> > +{
> > +       long val = (long)attr;
> > +
> > +       *to_free = false;
> > +       if (!val)
> > +               return NULL;
> > +       return str_list[val];
> > +}
> > +
> > +static const char *attr_speed_to_string(void *attr, bool *to_free)
> > +{
> > +       return attr_enum_to_string(attr, speed_str_list, to_free);
> > +}
> > +
> > +/* Get Attribute Methods */
> > +
> > +static void *attr_speed_get(void *test_or_suite, bool is_test)
> > +{
> > +       struct kunit_suite *suite = is_test ? NULL : test_or_suite;
> > +       struct kunit_case *test = is_test ? test_or_suite : NULL;
> > +
> > +       if (test)
> > +               return ((void *) test->attr.speed);
> > +       else
> > +               return ((void *) suite->attr.speed);
> > +}
> > +
> > +/* Attribute Struct Definitions */
> > +
> > +static const struct kunit_attr speed_attr = {
> > +       .name = "speed",
> > +       .get_attr = attr_speed_get,
> > +       .to_string = attr_speed_to_string,
> > +       .attr_default = (void *)KUNIT_SPEED_NORMAL,
> > +       .print = PRINT_ALWAYS,
> > +};
> > +
> >  /* List of all Test Attributes */
> >
> > -static struct kunit_attr kunit_attr_list[] = {};
> > +static struct kunit_attr kunit_attr_list[] = {speed_attr};
> >
> >  /* Helper Functions to Access Attributes */
> >
> > diff --git a/lib/kunit/kunit-example-test.c b/lib/kunit/kunit-example-test.c
> > index b69b689ea850..01a769f35e1d 100644
> > --- a/lib/kunit/kunit-example-test.c
> > +++ b/lib/kunit/kunit-example-test.c
> > @@ -220,6 +220,14 @@ static void example_params_test(struct kunit *test)
> >         KUNIT_EXPECT_EQ(test, param->value % param->value, 0);
> >  }
> >
> > +/*
> > + * This test should always pass. Can be used to practice filtering attributes.
> > + */
> > +static void example_slow_test(struct kunit *test)
> > +{
> > +       KUNIT_EXPECT_EQ(test, 1 + 1, 2);
> > +}
> > +
> >  /*
> >   * Here we make a list of all the test cases we want to add to the test suite
> >   * below.
> > @@ -237,6 +245,7 @@ static struct kunit_case example_test_cases[] = {
> >         KUNIT_CASE(example_all_expect_macros_test),
> >         KUNIT_CASE(example_static_stub_test),
> >         KUNIT_CASE_PARAM(example_params_test, example_gen_params),
> > +       KUNIT_CASE_SLOW(example_slow_test),
> >         {}
> >  };
> >
> > --
> > 2.41.0.255.g8b1d071c50-goog
> >