[PATCH v3 14/16] kunit: uapi: Add example for UAPI tests

[David Gow]

On Wed, 11 Jun 2025 at 15:38, Thomas Weißschuh
<thomas.weissschuh at linutronix.de> wrote:
>
> Extend the example to show how to run a userspace executable.
>
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh at linutronix.de>
> ---

Reviewed-by: David Gow <davidgow at google.com>

Cheers,
-- David



>  lib/kunit/Makefile             |  9 ++++++++-
>  lib/kunit/kunit-example-test.c | 15 +++++++++++++++
>  lib/kunit/kunit-example-uapi.c | 22 ++++++++++++++++++++++
>  3 files changed, 45 insertions(+), 1 deletion(-)
>
> diff --git a/lib/kunit/Makefile b/lib/kunit/Makefile
> index dafa09bd4241c24d31c4c19edecb67bf724127d7..e406a31df1df834a87961663de0b7921b59481c2 100644
> --- a/lib/kunit/Makefile
> +++ b/lib/kunit/Makefile
> @@ -30,4 +30,11 @@ obj-$(CONFIG_KUNIT_TEST) +=          string-stream-test.o
>  obj-$(CONFIG_KUNIT_TEST) +=            assert_test.o
>  endif
>
> -obj-$(CONFIG_KUNIT_EXAMPLE_TEST) +=    kunit-example-test.o
> +userprogs +=                           kunit-example-uapi
> +kunit-example-uapi-userccflags :=      -static
> +kunit-example-uapi-nolibc :=           $(CONFIG_ARCH_HAS_NOLIBC)
> +blobs +=                               kunit-example-uapi.blob.o
> +
> +obj-$(CONFIG_KUNIT_EXAMPLE_TEST) +=    kunit-example-mod.o
> +kunit-example-mod-y +=                 kunit-example-test.o
> +kunit-example-mod-$(CONFIG_KUNIT_UAPI) += kunit-example-uapi.blob.o
> diff --git a/lib/kunit/kunit-example-test.c b/lib/kunit/kunit-example-test.c
> index 3056d6bc705d0a8f196f0f4412e679dbb0e03114..b2681a6e047dfd6fea4a7cca60e81651d09c2eae 100644
> --- a/lib/kunit/kunit-example-test.c
> +++ b/lib/kunit/kunit-example-test.c
> @@ -6,8 +6,11 @@
>   * Author: Brendan Higgins <brendanhiggins at google.com>
>   */
>
> +#include <linux/blob.h>
> +
>  #include <kunit/test.h>
>  #include <kunit/static_stub.h>
> +#include <kunit/uapi.h>
>
>  /*
>   * This is the most fundamental element of KUnit, the test case. A test case
> @@ -277,6 +280,17 @@ static void example_slow_test(struct kunit *test)
>         KUNIT_EXPECT_EQ(test, 1 + 1, 2);
>  }
>
> +/*
> + * This test shows the usage of UAPI tests.
> + */
> +static void example_uapi_test(struct kunit *test)
> +{
> +       if (IS_ENABLED(CONFIG_KUNIT_UAPI))
> +               kunit_uapi_run_kselftest(test, BLOB(kunit_example_uapi));
> +       else
> +               kunit_skip(test, "CONFIG_KUNIT_UAPI is not enabled");
> +}
> +
>  /*
>   * Here we make a list of all the test cases we want to add to the test suite
>   * below.
> @@ -297,6 +311,7 @@ static struct kunit_case example_test_cases[] = {
>         KUNIT_CASE(example_priv_test),
>         KUNIT_CASE_PARAM(example_params_test, example_gen_params),
>         KUNIT_CASE_SLOW(example_slow_test),
> +       KUNIT_CASE(example_uapi_test),
>         {}
>  };
>
> diff --git a/lib/kunit/kunit-example-uapi.c b/lib/kunit/kunit-example-uapi.c
> new file mode 100644
> index 0000000000000000000000000000000000000000..4ce657050dd4a576632a41ca0309c4cb5134ce14
> --- /dev/null
> +++ b/lib/kunit/kunit-example-uapi.c
> @@ -0,0 +1,22 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * KUnit Userspace example test.
> + *
> + * Copyright (C) 2025, Linutronix GmbH.
> + * Author: Thomas Weißschuh <thomas.weissschuh at linutronix.de>
> + *
> + * This is *userspace* code.
> + */
> +
> +#include "../../tools/testing/selftests/kselftest.h"
> +
> +int main(void)
> +{
> +       ksft_print_header();
> +       ksft_set_plan(4);
> +       ksft_test_result_pass("userspace test 1\n");
> +       ksft_test_result_pass("userspace test 2\n");
> +       ksft_test_result_skip("userspace test 3: some reason\n");
> +       ksft_test_result_pass("userspace test 4\n");
> +       ksft_finished();
> +}
>
> --
> 2.49.0
>
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