linux-kernel - Re: [PATCH v2] kunit: add tests for using current KUnit test field

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Message-ID: <CAGS_qxp5NAox7eGqfa48zi5=QEgB48ior-tXwtDFEqCJ=vFCEA@mail.gmail.com>
Date:   Mon, 3 Apr 2023 16:17:29 -0700
From:   Daniel Latypov <dlatypov@...gle.com>
To:     Rae Moar <rmoar@...gle.com>
Cc:     brendanhiggins@...gle.com, davidgow@...gle.com,
        skhan@...uxfoundation.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2] kunit: add tests for using current KUnit test field

On Mon, Apr 3, 2023 at 1:19 PM Rae Moar <rmoar@...gle.com> wrote:
>
> Create test suite called "kunit_current" to add test coverage for the use
> of current->kunit_test, which returns the current KUnit test.
>
> Add two test cases:
> - kunit_current_test to test current->kunit_test and the method
>   kunit_get_current_test(), which utilizes current->kunit_test.
>
> - kunit_current_fail_test to test the method
>   kunit_fail_current_test(), which utilizes current->kunit_test.
>
> Signed-off-by: Rae Moar <rmoar@...gle.com>

Reviewed-by: Daniel Latypov <dlatypov@...gle.com>

Looks good and runs well here.
It's nice to have a test for this given kunit_fail_current_test() went
from a simple function call to now using `kunit_hooks` to do an
indirect call and relying on the `kunit_running` static key.


> ---
>
> Changes from v1->v2:
> - Combine two test cases to test both ways of getting current test in
>   kunit_current_test.
> - Changes to comments.
> - Add kunit_cleanup to kunit_current_fail_test.
>
>  lib/kunit/kunit-test.c | 42 +++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 41 insertions(+), 1 deletion(-)
>
> diff --git a/lib/kunit/kunit-test.c b/lib/kunit/kunit-test.c
> index b63595d3e241..42e44caa1bdd 100644
> --- a/lib/kunit/kunit-test.c
> +++ b/lib/kunit/kunit-test.c
> @@ -6,6 +6,7 @@
>   * Author: Brendan Higgins <brendanhiggins@...gle.com>
>   */
>  #include <kunit/test.h>
> +#include <kunit/test-bug.h>
>
>  #include "try-catch-impl.h"
>
> @@ -532,7 +533,46 @@ static struct kunit_suite kunit_status_test_suite = {
>         .test_cases = kunit_status_test_cases,
>  };
>
> +static void kunit_current_test(struct kunit *test)
> +{
> +       /* Check results of both current->kunit_test and
> +        * kunit_get_current_test() are equivalent to current test.
> +        */
> +       KUNIT_EXPECT_PTR_EQ(test, test, current->kunit_test);
> +       KUNIT_EXPECT_PTR_EQ(test, test, kunit_get_current_test());
> +}
> +
> +static void kunit_current_fail_test(struct kunit *test)
> +{
> +       struct kunit fake;
> +
> +       kunit_init_test(&fake, "fake test", NULL);
> +       KUNIT_EXPECT_EQ(test, fake.status, KUNIT_SUCCESS);
> +
> +       /* Set current->kunit_test to fake test. */
> +       current->kunit_test = &fake;
> +
> +       kunit_fail_current_test("This should make `fake` test fail.");
> +       KUNIT_EXPECT_EQ(test, fake.status, (enum kunit_status)KUNIT_FAILURE);
> +       kunit_cleanup(&fake);
> +
> +       /* Reset current->kunit_test to current test. */
> +       current->kunit_test = test;
> +}
> +
> +static struct kunit_case kunit_current_test_cases[] = {
> +       KUNIT_CASE(kunit_current_test),
> +       KUNIT_CASE(kunit_current_fail_test),
> +       {}
> +};
> +
> +static struct kunit_suite kunit_current_test_suite = {
> +       .name = "kunit_current",
> +       .test_cases = kunit_current_test_cases,
> +};
> +
>  kunit_test_suites(&kunit_try_catch_test_suite, &kunit_resource_test_suite,
> -                 &kunit_log_test_suite, &kunit_status_test_suite);
> +                 &kunit_log_test_suite, &kunit_status_test_suite,
> +                 &kunit_current_test_suite);
>
>  MODULE_LICENSE("GPL v2");
>
> base-commit: 7232282dd47cce6a780c9414bd9baccf232c7686
> --
> 2.40.0.348.gf938b09366-goog
>