[dpdk-dev] [PATCH v2] guides: add a testing guide for developing tests

[Aaron Conole]

Bruce Richardson <bruce.richardson at intel.com> writes:

> On Tue, Mar 02, 2021 at 10:07:26AM +0100, David Marchand wrote:
>> On Wed, Feb 10, 2021 at 3:56 PM Aaron Conole <aconole at redhat.com> wrote:
>> > diff --git a/doc/guides/contributing/testing.rst b/doc/guides/contributing/testing.rst
>> > new file mode 100644
>> > index 0000000000..86ca24ce43
>> > --- /dev/null
>> > +++ b/doc/guides/contributing/testing.rst
>> > @@ -0,0 +1,245 @@
>> > +..  SPDX-License-Identifier: BSD-3-Clause
>> > +    Copyright 2018 The DPDK contributors
>> 
>> 2021?

Whoops, I forgot to update my time machine.

>> > +
>> > +.. _testing_guidelines:
>> 
>> I can't find a call to the testing_guidelines reference, so this can be removed.

done.

>> 
>> [snip]
>> 
>> > +The suites can be selected by adding the ``--suite`` option to the
>> > +``meson test`` command.  Ex: ``meson test --suite fast-tests``::
>> > +
>> > +  $ meson test -C build --suite fast-tests
>> > +  ninja: Entering directory `/home/aconole/git/dpdk/build'
>> > +  [2543/2543] Linking target app/test/dpdk-test.
>> > +  1/60 DPDK:fast-tests / acl_autotest          OK       3.17 s
>> > +  2/60 DPDK:fast-tests / bitops_autotest       OK       0.22 s
>> > +  3/60 DPDK:fast-tests / byteorder_autotest    OK       0.22 s
>> > +  4/60 DPDK:fast-tests / cmdline_autotest      OK       0.28 s
>> > +  5/60 DPDK:fast-tests / common_autotest       OK       0.57 s
>> > +  6/60 DPDK:fast-tests / cpuflags_autotest     OK       0.27 s
>> > +  ...
>> 
>> Trying this in my build env, I get all tests failing.
>> This is because I run this as a normal user, but the system has
>> hugepages configured.
>> I figured this out quickly since I know the test framework (simply
>> added a echo 0; exit at the top of has-hugepages.sh).
>> But I am not sure a reader of this doc would be able to troubleshoot this.
>> 
>> Not sure if this is worth explaining here, or if we can enhance the
>> hugepage check (permissions maybe?).

I prefer to fix the hugepage check to make the tests SKIP when we don't
have hugepages accessible (so we need some kind of permission check in
there).  I will submit it separately.

>> 
>> [snip]
>> 
>> > +Checking code coverage
>> > +----------------------
>> > +The meson build system supports generating a code coverage report
>> > +via the `-Db_coverage=true` option, in conjunction with a package
>> > +like **lcov**, to generate an HTML code coverage report.  Example::
>> > +
>> > +  $ meson covered -Db_coverage=true
>> 
>> At first, I read "covered" as a meson command :-).
>> I prefer an explicit "meson setup covered -Db_coverage=true", but well
>> this is more a matter of taste.
>> 
>>
>
> I also tend to prefer the build directory name at the end of the command,
> so I'd suggest: "meson setup -Db_coverage=true covered".  Furthermore,
> while I can understand the use of "covered" as a build directory name, I
> think for consistency across all docs, we should just use "build" here as
> the directory name, which again will reduce confusion.  "meson setup
> -Db_coverage build"

Okay - I will paint this bikeshed like:

   meson setup build -Db_coverage=true

It's a little inconsistent everywhere - so I guess a good janitor
project would be to clean up all the places we have meson commands.

Otherwise, what I've found is that the options generally come after the
build directory / command is specified (ex: see octeontx, the arm64
cross build docs, etc.) so I'll keep that for consistency there.
Hopefully we will consistently become more consistent :)

> /Bruce