Date:   Tue, 2 May 2017 16:15:09 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Mickaël Salaün <mic@...ikod.net>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jonathan Corbet <corbet@....net>,
        Shuah Khan <shuah@...nel.org>, Will Drewry <wad@...omium.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 6/6] Documentation/dev-tools: Add kselftest_harness documentation

On Tue, May 2, 2017 at 3:26 PM, Mickaël Salaün <mic@...ikod.net> wrote:
> Add metadata to kselftest_harness.h to be able to include the comments
> in the Sphinx documentation.
>
> Signed-off-by: Mickaël Salaün <mic@...ikod.net>
> Cc: Andy Lutomirski <luto@...capital.net>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Kees Cook <keescook@...omium.org>
> Cc: Shuah Khan <shuah@...nel.org>
> Cc: Will Drewry <wad@...omium.org>
> ---
>  Documentation/dev-tools/kselftest.rst       |  57 ++++++
>  tools/testing/selftests/kselftest_harness.h | 259 ++++++++++++++++++++--------
>  2 files changed, 243 insertions(+), 73 deletions(-)
>
> diff --git a/Documentation/dev-tools/kselftest.rst b/Documentation/dev-tools/kselftest.rst
> index 39af2cb3d248..cf1e1f262c44 100644
> --- a/Documentation/dev-tools/kselftest.rst
> +++ b/Documentation/dev-tools/kselftest.rst
> @@ -138,3 +138,60 @@ Contributing new tests (details)
>     executable which is not tested by default.
>     TEST_FILES, TEST_GEN_FILES mean it is the file which is used by
>     test.
> +
> +Test Harness
> +------------
> +
> +The *kselftest_harness.h* file contains useful helpers to build tests. The
> +tests from seccomp/seccomp_bpf.c can be used as examples.
> +
> +Example
> +~~~~~~~
> +
> +.. code-block:: c
> +
> +    #include "../kselftest_harness.h"
> +
> +    TEST(standalone_test) {
> +      do_some_stuff;
> +      EXPECT_GT(10, stuff) {
> +         stuff_state_t state;
> +         enumerate_stuff_state(&state);
> +         TH_LOG("expectation failed with state: %s", state.msg);
> +      }
> +      more_stuff;
> +      ASSERT_NE(some_stuff, NULL) TH_LOG("how did it happen?!");
> +      last_stuff;
> +      EXPECT_EQ(0, last_stuff);
> +    }
> +
> +    FIXTURE(my_fixture) {
> +      mytype_t *data;
> +      int awesomeness_level;
> +    };
> +    FIXTURE_SETUP(my_fixture) {
> +      self->data = mytype_new();
> +      ASSERT_NE(NULL, self->data);
> +    }
> +    FIXTURE_TEARDOWN(my_fixture) {
> +      mytype_free(self->data);
> +    }
> +    TEST_F(my_fixture, data_is_good) {
> +      EXPECT_EQ(1, is_my_data_good(self->data));
> +    }
> +
> +    TEST_HARNESS_MAIN
> +
> +
> +Helpers
> +~~~~~~~~~
> +
> +.. kernel-doc:: tools/testing/selftests/kselftest_harness.h
> +    :doc: helpers
> +
> +
> +Operators
> +~~~~~~~~~
> +
> +.. kernel-doc:: tools/testing/selftests/kselftest_harness.h
> +    :doc: operators

Awesome! Yay docs!

> diff --git a/tools/testing/selftests/kselftest_harness.h b/tools/testing/selftests/kselftest_harness.h
> index 8ba227db46aa..eddddfe50c80 100644
> --- a/tools/testing/selftests/kselftest_harness.h
> +++ b/tools/testing/selftests/kselftest_harness.h
> @@ -4,38 +4,6 @@
>   *
>   * kselftest_harness.h: simple C unit test helper.
>   *
> - * Usage:

Can you add a pointer to the .rst file so someone looking at the
header file will find out where to get an example?

Otherwise, looks great!

-Kees

> - *   #include "../kselftest_harness.h"
> - *   TEST(standalone_test) {
> - *     do_some_stuff;
> - *     EXPECT_GT(10, stuff) {
> - *        stuff_state_t state;
> - *        enumerate_stuff_state(&state);
> - *        TH_LOG("expectation failed with state: %s", state.msg);
> - *     }
> - *     more_stuff;
> - *     ASSERT_NE(some_stuff, NULL) TH_LOG("how did it happen?!");
> - *     last_stuff;
> - *     EXPECT_EQ(0, last_stuff);
> - *   }
> - *
> - *   FIXTURE(my_fixture) {
> - *     mytype_t *data;
> - *     int awesomeness_level;
> - *   };
> - *   FIXTURE_SETUP(my_fixture) {
> - *     self->data = mytype_new();
> - *     ASSERT_NE(NULL, self->data);
> - *   }
> - *   FIXTURE_TEARDOWN(my_fixture) {
> - *     mytype_free(self->data);
> - *   }
> - *   TEST_F(my_fixture, data_is_good) {
> - *     EXPECT_EQ(1, is_my_data_good(self->data));
> - *   }
> - *
> - *   TEST_HARNESS_MAIN
> - *
>   * API inspired by code.google.com/p/googletest
>   */
>
> @@ -58,7 +26,13 @@
>   * Exported APIs
>   */
>
> -/* TEST(name) { implementation }
> +/**
> + * DOC: helpers
> + *
> + * .. code-block:: c
> + *
> + *     TEST(name) { implementation }
> + *
>   * Defines a test by name.
>   * Names must be unique and tests must not be run in parallel.  The
>   * implementation containing block is a function and scoping should be treated
> @@ -68,7 +42,13 @@
>   */
>  #define TEST TEST_API(TEST)
>
> -/* TEST_SIGNAL(name, signal) { implementation }
> +/**
> + * DOC: helpers
> + *
> + * .. code-block:: c
> + *
> + *     TEST_SIGNAL(name, signal) { implementation }
> + *
>   * Defines a test by name and the expected term signal.
>   * Names must be unique and tests must not be run in parallel.  The
>   * implementation containing block is a function and scoping should be treated
> @@ -78,25 +58,43 @@
>   */
>  #define TEST_SIGNAL TEST_API(TEST_SIGNAL)
>
> -/* FIXTURE(datatype name) {
> - *   type property1;
> - *   ...
> - * };
> - * Defines the data provided to TEST_F()-defined tests as |self|.  It should be
> +/**
> + * DOC: helpers
> + *
> + * .. code-block:: c
> + *
> + *     FIXTURE(datatype name) {
> + *       type property1;
> + *       ...
> + *     };
> + *
> + * Defines the data provided to TEST_F()-defined tests as \|self\|.  It should be
>   * populated and cleaned up using FIXTURE_SETUP and FIXTURE_TEARDOWN.
>   */
>  #define FIXTURE TEST_API(FIXTURE)
>
> -/* FIXTURE_DATA(datatype name)
> +/**
> + * DOC: helpers
> + *
> + * .. code-block:: c
> + *
> + *     FIXTURE_DATA(datatype name)
> + *
>   * This call may be used when the type of the fixture data
>   * is needed.  In general, this should not be needed unless
> - * the |self| is being passed to a helper directly.
> + * the \|self\| is being passed to a helper directly.
>   */
>  #define FIXTURE_DATA TEST_API(FIXTURE_DATA)
>
> -/* FIXTURE_SETUP(fixture name) { implementation }
> +/**
> + * DOC: helpers
> + *
> + * .. code-block:: c
> + *
> + *     FIXTURE_SETUP(fixture name) { implementation }
> + *
>   * Populates the required "setup" function for a fixture.  An instance of the
> - * datatype defined with _FIXTURE_DATA will be exposed as |self| for the
> + * datatype defined with _FIXTURE_DATA will be exposed as \|self\| for the
>   * implementation.
>   *
>   * ASSERT_* are valid for use in this context and will prempt the execution
> @@ -106,84 +104,199 @@
>   */
>  #define FIXTURE_SETUP TEST_API(FIXTURE_SETUP)
>
> -/* FIXTURE_TEARDOWN(fixture name) { implementation }
> +/**
> + * DOC: helpers
> + *
> + * .. code-block:: c
> + *
> + *     FIXTURE_TEARDOWN(fixture name) { implementation }
> + *
>   * Populates the required "teardown" function for a fixture.  An instance of the
> - * datatype defined with _FIXTURE_DATA will be exposed as |self| for the
> + * datatype defined with _FIXTURE_DATA will be exposed as \|self\| for the
>   * implementation to clean up.
>   *
>   * A bare "return;" statement may be used to return early.
>   */
>  #define FIXTURE_TEARDOWN TEST_API(FIXTURE_TEARDOWN)
>
> -/* TEST_F(fixture, name) { implementation }
> +/**
> + * DOC: helpers
> + *
> + * .. code-block:: c
> + *
> + *     TEST_F(fixture, name) { implementation }
> + *
>   * Defines a test that depends on a fixture (e.g., is part of a test case).
> - * Very similar to TEST() except that |self| is the setup instance of fixture's
> + * Very similar to TEST() except that \|self\| is the setup instance of fixture's
>   * datatype exposed for use by the implementation.
>   */
>  #define TEST_F TEST_API(TEST_F)
>
>  #define TEST_F_SIGNAL TEST_API(TEST_F_SIGNAL)
>
> -/* Use once to append a main() to the test file. E.g.,
> - *   TEST_HARNESS_MAIN
> +/**
> + * DOC: helpers
> + *
> + * .. code-block:: c
> + *
> + *     TEST_HARNESS_MAIN
> + *
> + * Use once to append a main() to the test file.
>   */
>  #define TEST_HARNESS_MAIN TEST_API(TEST_HARNESS_MAIN)
>
> -/*
> +/**
> + * DOC: operators
> + *
>   * Operators for use in TEST and TEST_F.
>   * ASSERT_* calls will stop test execution immediately.
>   * EXPECT_* calls will emit a failure warning, note it, and continue.
>   */
>
> -/* ASSERT_EQ(expected, measured): expected == measured */
> +/**
> + * DOC: operators
> + *
> + * * ASSERT_EQ(expected, measured): expected == measured
> + */
>  #define ASSERT_EQ TEST_API(ASSERT_EQ)
> -/* ASSERT_NE(expected, measured): expected != measured */
> +/**
> + * DOC: operators
> + *
> + * * ASSERT_NE(expected, measured): expected != measured
> + */
>  #define ASSERT_NE TEST_API(ASSERT_NE)
> -/* ASSERT_LT(expected, measured): expected < measured */
> +/**
> + * DOC: operators
> + *
> + * * ASSERT_LT(expected, measured): expected < measured
> + */
>  #define ASSERT_LT TEST_API(ASSERT_LT)
> -/* ASSERT_LE(expected, measured): expected <= measured */
> +/**
> + * DOC: operators
> + *
> + * * ASSERT_LE(expected, measured): expected <= measured
> + */
>  #define ASSERT_LE TEST_API(ASSERT_LE)
> -/* ASSERT_GT(expected, measured): expected > measured */
> +/**
> + * DOC: operators
> + *
> + * * ASSERT_GT(expected, measured): expected > measured
> + */
>  #define ASSERT_GT TEST_API(ASSERT_GT)
> -/* ASSERT_GE(expected, measured): expected >= measured */
> +/**
> + * DOC: operators
> + *
> + * * ASSERT_GE(expected, measured): expected >= measured
> + */
>  #define ASSERT_GE TEST_API(ASSERT_GE)
> -/* ASSERT_NULL(measured): NULL == measured */
> +/**
> + * DOC: operators
> + *
> + * * ASSERT_NULL(measured): NULL == measured
> + */
>  #define ASSERT_NULL TEST_API(ASSERT_NULL)
> -/* ASSERT_TRUE(measured): measured != 0 */
> +/**
> + * DOC: operators
> + *
> + * * ASSERT_TRUE(measured): measured != 0
> + */
>  #define ASSERT_TRUE TEST_API(ASSERT_TRUE)
> -/* ASSERT_FALSE(measured): measured == 0 */
> +/**
> + * DOC: operators
> + *
> + * * ASSERT_FALSE(measured): measured == 0
> + */
>  #define ASSERT_FALSE TEST_API(ASSERT_FALSE)
> -/* ASSERT_STREQ(expected, measured): !strcmp(expected, measured) */
> +/**
> + * DOC: operators
> + *
> + * * ASSERT_STREQ(expected, measured): !strcmp(expected, measured)
> + */
>  #define ASSERT_STREQ TEST_API(ASSERT_STREQ)
> -/* ASSERT_STRNE(expected, measured): strcmp(expected, measured) */
> +/**
> + * DOC: operators
> + *
> + * * ASSERT_STRNE(expected, measured): strcmp(expected, measured)
> + */
>  #define ASSERT_STRNE TEST_API(ASSERT_STRNE)
> -/* EXPECT_EQ(expected, measured): expected == measured */
> +/**
> + * DOC: operators
> + *
> + * * EXPECT_EQ(expected, measured): expected == measured
> + */
>  #define EXPECT_EQ TEST_API(EXPECT_EQ)
> -/* EXPECT_NE(expected, measured): expected != measured */
> +/**
> + * DOC: operators
> + *
> + * * EXPECT_NE(expected, measured): expected != measured
> + */
>  #define EXPECT_NE TEST_API(EXPECT_NE)
> -/* EXPECT_LT(expected, measured): expected < measured */
> +/**
> + * DOC: operators
> + *
> + * * EXPECT_LT(expected, measured): expected < measured
> + */
>  #define EXPECT_LT TEST_API(EXPECT_LT)
> -/* EXPECT_LE(expected, measured): expected <= measured */
> +/**
> + * DOC: operators
> + *
> + * * EXPECT_LE(expected, measured): expected <= measured
> + */
>  #define EXPECT_LE TEST_API(EXPECT_LE)
> -/* EXPECT_GT(expected, measured): expected > measured */
> +/**
> + * DOC: operators
> + *
> + * * EXPECT_GT(expected, measured): expected > measured
> + */
>  #define EXPECT_GT TEST_API(EXPECT_GT)
> -/* EXPECT_GE(expected, measured): expected >= measured */
> +/**
> + * DOC: operators
> + *
> + * * EXPECT_GE(expected, measured): expected >= measured
> + */
>  #define EXPECT_GE TEST_API(EXPECT_GE)
> -/* EXPECT_NULL(measured): NULL == measured */
> +/**
> + * DOC: operators
> + *
> + * * EXPECT_NULL(measured): NULL == measured
> + */
>  #define EXPECT_NULL TEST_API(EXPECT_NULL)
> -/* EXPECT_TRUE(measured): 0 != measured */
> +/**
> + * DOC: operators
> + *
> + * * EXPECT_TRUE(measured): 0 != measured
> + */
>  #define EXPECT_TRUE TEST_API(EXPECT_TRUE)
> -/* EXPECT_FALSE(measured): 0 == measured */
> +/**
> + * DOC: operators
> + *
> + * * EXPECT_FALSE(measured): 0 == measured
> + */
>  #define EXPECT_FALSE TEST_API(EXPECT_FALSE)
> -/* EXPECT_STREQ(expected, measured): !strcmp(expected, measured) */
> +/**
> + * DOC: operators
> + *
> + * * EXPECT_STREQ(expected, measured): !strcmp(expected, measured)
> + */
>  #define EXPECT_STREQ TEST_API(EXPECT_STREQ)
> -/* EXPECT_STRNE(expected, measured): strcmp(expected, measured) */
> +/**
> + * DOC: operators
> + *
> + * * EXPECT_STRNE(expected, measured): strcmp(expected, measured)
> + */
>  #define EXPECT_STRNE TEST_API(EXPECT_STRNE)
>
> -/* TH_LOG(format, ...)
> +/**
> + * DOC: helpers
> + *
> + * .. code-block:: c
> + *
> + *     TH_LOG(format, ...)
> + *
>   * Optional debug logging function available for use in tests.
>   * Logging may be enabled or disabled by defining TH_LOG_ENABLED.
>   * E.g., #define TH_LOG_ENABLED 1
> + *
>   * If no definition is provided, logging is enabled by default.
>   */
>  #define TH_LOG  TEST_API(TH_LOG)
> --
> 2.11.0
>



-- 
Kees Cook
Pixel Security

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