New tests: GTK3 platform accessibility

[Michael Weghorn]

On 2023-08-24 13:38, Stephan Bergmann wrote:
> 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?

In my test, it failed differently on Wayland, and forcing the X11 Gdk 
backend makes that work:
https://gerrit.libreoffice.org/c/core/+/156086

Does that fix your case as well?
Otherwise: Does the test work when run in an X11 session instead?
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