[pygobject] tests: set NO_AT_BRIDGE

[Christoph Reiter <creiter src gnome org>]

commit b05349db1a224e9782d9873860d19783e7eb4dc3
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sat Nov 16 13:42:29 2019 +0100

    tests: set NO_AT_BRIDGE
    
    Otherwise we get "Couldn't register with accessibility bus" warnings which break the
    tests.

 tests/__init__.py | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/tests/__init__.py b/tests/__init__.py
index 3723b073..c5f02c31 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -89,6 +89,9 @@ def init_test_environ():
     os.environ['GSETTINGS_SCHEMA_DIR'] = tests_builddir
     os.environ['G_FILENAME_ENCODING'] = 'UTF-8'
 
+    # Avoid accessibility dbus warnings
+    os.environ['NO_AT_BRIDGE'] = '1'
+
     # Force the default theme so broken themes don't affect the tests
     os.environ['GTK_THEME'] = 'Adwaita'