linux-kernel - Re: [PATCH] selftests: Add information about TAP conformance in tests

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Date: Tue, 11 Jun 2024 14:27:52 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: Muhammad Usama Anjum <usama.anjum@...labora.com>,
 Shuah Khan <shuah@...nel.org>, Jonathan Corbet <corbet@....net>
Cc: kernel@...labora.com, linux-kselftest@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] selftests: Add information about TAP conformance in tests

On 6/10/24 02:32, Muhammad Usama Anjum wrote:
> Although "TAP" word is being used already in documentation, but it hasn't
> been defined in informative way for developers that how to write TAP
> conformant tests and what are the benefits. Write a short brief about it.
> 
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
>   Documentation/dev-tools/kselftest.rst | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/dev-tools/kselftest.rst b/Documentation/dev-tools/kselftest.rst
> index dcf634e411bd9..b579f491f3e97 100644
> --- a/Documentation/dev-tools/kselftest.rst
> +++ b/Documentation/dev-tools/kselftest.rst
> @@ -228,6 +228,14 @@ In general, the rules for selftests are
>    * Don't cause the top-level "make run_tests" to fail if your feature is
>      unconfigured.
>   
> + * The output of tests must conform to the TAP standard to ensure high
> +   testing quality and to capture failures/errors with specific details.
> +   The kselftest.h and kselftest_harness.h headers provide wrappers for
> +   outputting test results such as pass, fail, or skip etc. These wrappers
> +   should be used instead of reinventing the wheel or using raw printf and

When there are multiple tests supported by a test suite, it doesn't
make sense to convert every single print statement. That is the reason
why we have the run_tests wrapper that prints the summary in TAP format.

I would rephrase this to say "should be used for pass, fail, exit, and
skip messages".

This rule is applicable to only the tests that are in the selftests Makefile
and included in the default run.

There is no need to convert every single print statement in tests.

> +   exit statements. CI systems can easily parse TAP output messages to
> +   detect test failures.

I would rather see people spending energy writing new tests and fixing
warnings. TAP conversions need to be focused if they add value.

thanks,
-- Shuah