linux-kernel - Re: [PATCH v2 1/1] Documentation: dev-tools: clarify KTAP specification wording

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Date:   Mon, 7 Feb 2022 10:38:52 -0600
From:   Frank Rowand <frowand.list@...il.com>
To:     Jonathan Corbet <corbet@....net>, David Gow <davidgow@...gle.com>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>, Rae Moar <rmoar@...gle.com>,
        Tim.Bird@...y.com, Brendan Higgins <brendanhiggins@...gle.com>
Cc:     rmr167@...il.com, guillaume.tucker@...labora.com,
        dlatypov@...gle.com, kernelci@...ups.io,
        kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] Documentation: dev-tools: clarify KTAP
 specification wording

On 2/7/22 10:28 AM, frowand.list@...il.com wrote:
> From: Frank Rowand <frank.rowand@...y.com>
> 
> Add the spec version to the title line.
> 
> Explain likely source of "Unknown lines".
> 
> "Unknown lines" in nested tests are optionally indented.
> 
> Add "Unknown lines" items to differences between TAP & KTAP list
> 
> Signed-off-by: Frank Rowand <frank.rowand@...y.com>
> ---

Please do not apply this version (v2).  I was working off the KTAP specification
from a different github repo than I should have been referencing.

v3 upcoming.

-Frank

> 
> Changes since version 1
>   - Explain likely source of "Unknown lines"
>   - "Unknown line" in nested tests are optionally indented
>   - Add "Unknown lines" items to differences between TAP & KTAP list
> 
>  Documentation/dev-tools/ktap.rst | 24 ++++++++++++++++++------
>  1 file changed, 18 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/dev-tools/ktap.rst b/Documentation/dev-tools/ktap.rst
> index 878530cb9c27..9c40c94d3f12 100644
> --- a/Documentation/dev-tools/ktap.rst
> +++ b/Documentation/dev-tools/ktap.rst
> @@ -1,8 +1,8 @@
>  .. SPDX-License-Identifier: GPL-2.0
>  
> -========================================
> -The Kernel Test Anything Protocol (KTAP)
> -========================================
> +===================================================
> +The Kernel Test Anything Protocol (KTAP), version 1
> +===================================================
>  
>  TAP, or the Test Anything Protocol is a format for specifying test results used
>  by a number of projects. It's website and specification are found at this `link
> @@ -174,6 +174,13 @@ There may be lines within KTAP output that do not follow the format of one of
>  the four formats for lines described above. This is allowed, however, they will
>  not influence the status of the tests.
>  
> +This is an important difference from TAP.  Kernel tests may print messages
> +to the system console or a log file.  Both of these destinations may contain
> +messages either from unrelated kernel or userspace activity, or kernel
> +messages from non-test code that is invoked by the test.  The kernel code
> +invoked by the test likely is not aware that a test is in progress and
> +thus can not print the message as a diagnostic message.
> +
>  Nested tests
>  ------------
>  
> @@ -186,10 +193,13 @@ starting with another KTAP version line and test plan, and end with the overall
>  result. If one of the subtests fail, for example, the parent test should also
>  fail.
>  
> -Additionally, all result lines in a subtest should be indented. One level of
> +Additionally, all lines in a subtest should be indented. One level of
>  indentation is two spaces: "  ". The indentation should begin at the version
>  line and should end before the parent test's result line.
>  
> +"Unknown lines" are not considered to be lines in a subtest and thus are
> +allowed to be either indented or not indented.
> +
>  An example of a test with two nested subtests:
>  
>  .. code-block::
> @@ -225,9 +235,11 @@ Major differences between TAP and KTAP
>  --------------------------------------
>  
>  Note the major differences between the TAP and KTAP specification:
> -- yaml and json are not recommended in diagnostic messages
> -- TODO directive not recognized
> +- yaml and json are not recommended in KTAP diagnostic messages
> +- TODO directive not recognized in KTAP
>  - KTAP allows for an arbitrary number of tests to be nested
> +- TAP includes "Unknown lines" in the category of "Anything else"
> +- TAP says "Unknown lines" are "incorrect; KTAP allows "Unknown lines"
>  
>  The TAP14 specification does permit nested tests, but instead of using another
>  nested version line, uses a line of the form
>