[gnome-photos/sam/tests-isolated-xdg-data-dirs: 1/2] tests: Set G_TEST_BUILDDIR

[Sam Thursfield <sthursfield src gnome org>]

commit 967b7b11e467727c66fd275fc669a850a633af8e
Author: Sam Thursfield <sam afuera me uk>
Date:   Sat Sep 28 14:53:06 2019 +0200

    tests: Set G_TEST_BUILDDIR
    
    This seems to be needed for the basic.py test to run successfully under
    `meson test`.

 tests/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/tests/meson.build b/tests/meson.build
index eea33e20..38931dd1 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -24,6 +24,7 @@ endif
 if get_option('dogtail')
   test_env = [
     'LC_ALL=C',
+    'G_TEST_BUILDDIR=@0@'.format(meson.current_build_dir()),
     'GSETTINGS_BACKEND=memory',
   ]