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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date:   Thu, 24 Sep 2020 14:18:12 -0700
Message-ID: <CABBYNZKgUNwJ7scKSq99=nWPqmPuYsTp8fEL+JSAyrKfcK3zkg@mail.gmail.com>
Subject: Re: Modifying Makefile.am to facilitate test-adv-monitor and future
 unit tests.
To:     Miao-chen Chou <mcchou@chromium.org>
Cc:     Bluetooth Kernel Mailing List <linux-bluetooth@vger.kernel.org>,
        Marcel Holtmann <marcel@holtmann.org>,
        Luiz Augusto von Dentz <luiz.von.dentz@intel.com>,
        Alain Michaud <alainm@chromium.org>,
        Manish Mandlik <mmandlik@chromium.org>,
        Howard Chung <howardchung@google.com>,
        Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
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Hi Miao,

On Thu, Sep 24, 2020 at 1:44 PM Miao-chen Chou <mcchou@chromium.org> wrote:
>
> Hi Luiz,
>
>
> On Mon, Sep 21, 2020 at 6:44 PM Luiz Augusto von Dentz
> <luiz.dentz@gmail.com> wrote:
> >
> > Hi Miao,
> >
> > On Mon, Sep 21, 2020 at 12:21 PM Miao-chen Chou <mcchou@chromium.org> wrote:
> > >
> > > Hi Luiz,
> > >
> > > On Fri, Sep 18, 2020 at 3:12 PM Luiz Augusto von Dentz
> > > <luiz.dentz@gmail.com> wrote:
> > > >
> > > > Hi Miao,
> > > >
> > > > On Fri, Sep 18, 2020 at 12:44 PM Miao-chen Chou <mcchou@chromium.org> wrote:
> > > > >
> > > > > Hi Luiz and Marcel,
> > > > >
> > > > > Unlike the rest of the existing unit tests in BlueZ, the logic blocks
> > > > > tested in test-adv-monitor require dependencies of not only
> > > > > src/adv_monitor.c but also all the dependency tree of
> > > > > src/adv_monitor.c. The current convention in Makefile.am is to add all
> > > > > the extra dependencies one by one. However, the maintenance cost is
> > > > > high and not suitable in the case of test-adv-monitor. Therefore, we'd
> > > > > like to propose changes in Makefile.am to make the source of
> > > > > bluetoothd as a static library and link it for bluetoothd target and
> > > > > the unit test target. It would be great if you can provide feedback on
> > > > > this idea before the implementation. Thanks in advance!
> > > >
> > > > Then we should have had the code move to src/shared for unit testing,
> > > > but how exactly are you planning to do that? For testing the kernel
> > > > interface it normally done via a dedicated tester, but that again can
> > > > be done with shared library.
> > > >
> > > In series https://patchwork.kernel.org/project/bluetooth/list/?series=351021,
> > > we introduced some helper functions in adv_monitor.h to perform unit
> > > testing and test-adv-monitor to facilitate the unit tests of
> > > adv_monitor. We are encountering an expected build check failure on
> > > this series.
> > >
> > > There are two categories in test-adv-monitor, content filtering and
> > > RSSI tracking, and content filter is easy to be moved to a standalone
> > > shared component while RSSI tracking involves the use of timer, D-Bus
> > > method calls and adv_monitor's internal structures, and that makes it
> > > strongly coupled with the adv_monitor implementation which require a
> > > tree of dependencies apart from adv_monitor.
> > >
> > > There are two options to resolve the build failures in our case.
> > > (1) Reorganize Makefile.am
> > > This option is to make the sources (except src/main.c) into a static
> > > lib and link this lib in bluetoothd executable target and whichever
> > > unit test the sources are required.
> > > (2) Create src/shared/am to facilitate helpers and core logic
> > > This option is to create a new source under src/shared/ to facilitate
> > > helper functions and core logic for src/adv_monitor. The interface of
> > > src/shared/am may have the following functions.
> > > - Create/destroy functions of struct adv_monitor
> > > - Create/destroy functions of struct adv_monitor_device
> > > - Helper function for monitor content matching.
> > > - Helper function for RSSI tracking
> > > However, the logic of RSSI tracking is hard to be ripped off and moved
> > > to src/shared/am. One example would be the use of timer in RSSI
> > > tracking, and there is currently no previous example of the timer use
> > > in the shared library.
> >
> > Not really following regarding the dependency on D-Bus, usually shared
> > don't have dependency on that because the code would be part of the
> > deamon and in that case you would be better of  testing that direct
> > via a tester that does exercise its D-Bus API. Lets be clear here,
> > except for gbus itself all our tests under unit directory are for C
> > function testing, if you want to test a D-Bus interface then we need a
> > tester that would do that over D-Bus.
> >
> > > Series https://patchwork.kernel.org/project/bluetooth/list/?series=351021
> > > is up for review. Our next step here would be ripped off the unit test
> > > for now and submit v5 of the series. Once we reach an conclusion on
> > > advmon unit test, we can submit a separate series including the
> > > refactoring and unit tests. Looking forward to any feedbacks. Thanks!
> >
> > I'd strip the testing for now since it doesn't seem we are on sync to
> > how we test things apparently.
> >
> Thanks for your reply. We need to rethink how to perform the testing.
> And agree, we do plan to strip the testing for now from our series.

Btw, I do recall seeing D-Bus level tests in chromium, have you guys
stopped developing them?

> > > Regards,
> > > Miao
> >
> >
> >
> > --
> > Luiz Augusto von Dentz


-- 
Luiz Augusto von Dentz