linux-kernel - Re: [PATCH v2 2/3] Documentation: KUnit: reword description of assertions

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Date:   Tue, 15 Nov 2022 10:07:03 -0800
From:   Daniel Latypov <dlatypov@...gle.com>
To:     David Gow <davidgow@...gle.com>
Cc:     Sadiya Kazi <sadiyakazi@...gle.com>, brendanhiggins@...gle.com,
        rmoar@...gle.com, linux-kernel@...r.kernel.org,
        kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        linux-doc@...r.kernel.org, skhan@...uxfoundation.org
Subject: Re: [PATCH v2 2/3] Documentation: KUnit: reword description of assertions

On Mon, Nov 14, 2022 at 11:45 PM David Gow <davidgow@...gle.com> wrote:

<snip>

> +1 for the patch from me (modulo the "we" typo Sadiya mentioned).
>
> I otherwise also prefer Daniel's original here (though I'd possibly
> merge it into one sentence, personally).
> Maybe:
> "In this example, as we need to be able to allocate an array in order
> to test the sort function, we use ``KUNIT_ASSERT_NOT_ERR_OR_NULL()``
> to abort the test if there's an allocation error."
> or
> "In this example, we need to allocate an array to test the sort
> function. We therefore use ``KUNIT_ASSERT_NOT_ERR_OR_NULL()``, which
> will automatically abort the test if there's an allocation error."
>
> But any of the above wordings are fine for me.
>
> The note about ASSERT() working in any function is useful, though
> there are definitely some "gotcha"s caused by killing the kthread
> we'll need to resolve. (If there are any dangling references to things
> on the stack, for example.) Still, not an issue for this bit of
> documentation.
>
> Reviewed-by: David Gow <davidgow@...gle.com>
>
> (Once the "we" typo is fixed.)

v3 is here, PTAL
https://lore.kernel.org/all/20221111182906.1377191-2-dlatypov@google.com/

Copying the relevant section here:
+In this example, we need to be able to allocate an array to test the ``sort()``
+function. So we use ``KUNIT_ASSERT_NOT_ERR_OR_NULL()`` to abort the test if
+there's an allocation error.
+
+.. note::
+   In other test frameworks, ``ASSERT`` macros are often implemented by calling
+   ``return`` so they only work from the test function. In KUnit, we stop the
+   current kthread on failure, so you can call them from anywhere.

Daniel