New tests: GTK3 platform accessibility

[Stephan Bergmann]

On 8/1/23 19:30, Colomban Wendling wrote:
> These tests are enabled by default if all dependencies are available. 
> That is a working Xvfb [4], dbus-launch, and the AT-SPI2 library [5] 
> which is used to communicate with the platform accessibility daemon.  It 
> is also possible to either enable or disable them forcefully, using 
> --enable-atspi-test and --disable-atspi-tests respectively.

When I --enable-atspi-tests (which passes configure) on my local Fedora 
38 Linux machine, CppunitTest_vcl_gtk3_a11y fails the

>         assert(m_pAtspiApp);

in Atspi2TestBase::setUp 
(vcl/qa/cppunit/a11y/atspi2/atspi2testbase.hxx), apparently because

>             Atspi::Accessible desktop(atspi_get_desktop(desktopId));

in Atspi2TestBase::getApp 
(vcl/qa/cppunit/a11y/atspi2/atspi2testbase.hxx) produces

> ** (cppunittester:1641471): WARNING **: 12:56:34.251: AT-SPI: Could not obtain desktop path or name
> 
> 
> (cppunittester:1641471): dbind-WARNING **: 12:56:34.251: Couldn't get application list: Could not activate remote peer: unit failed.
> 
> (cppunittester:1641471): GLib-GObject-CRITICAL **: 12:56:34.251: g_object_unref: assertion 'G_IS_OBJECT (object)' failed

on stderr but returns an empty Atspi::Accessible with no children to 
iterate over.

Is there perhaps anything I would need to additionally install or to 
enable to make this work?  Or does it just not work on Wayland?