linux-kernel - Re: [PATCH] drm/todo: Add entry for using kunit in the subsystem

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Date:   Wed, 4 May 2022 10:10:30 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jonathan Corbet <corbet@....net>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH] drm/todo: Add entry for using kunit in the subsystem

Hi,

On Wed, May 04, 2022 at 10:02:12AM +0200, Javier Martinez Canillas wrote:
> The Kernel Unit Testing (KUnit) framework provides a common framework for
> unit tests within the Linux kernel. Having a test suite would allow to
> identify regressions earlier.
> 
> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> ---
> 
>  Documentation/gpu/todo.rst | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst
> index 127e76ee0b2d..10bfb50908d1 100644
> --- a/Documentation/gpu/todo.rst
> +++ b/Documentation/gpu/todo.rst
> @@ -603,6 +603,20 @@ Level: Advanced
>  Better Testing
>  ==============
>  
> +Add unit tests using the Kernel Unit Testing (KUnit) framework
> +--------------------------------------------------------------
> +
> +The `KUnit <https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html>`_
> +provides a common framework for unit tests within the Linux kernel. Having a
> +test suite would allow to identify regressions earlier.
> +
> +A good candidate for the first unit tests are the format-conversion helpers in
> +``drm_format_helper.c``.
> +
> +Contact: Javier Martinez Canillas <javierm@...hat.com>
> +
> +Level: Intermediate

Kunit is fairly easy to grasp if you have some knowledge of other unit
testing frameworks already (pytest, cmocka, etc.)

Another good candidate would be to convert (some ?) selftests to kunit.
I'm not sure the others, but at least test-drm_cmdline_parser should be
fairly easy to convert.

Maxime

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