gtk object tests: run under local environment

Make sure that the tests don't access the host's session bus or
installed gsettings schemas.

Also disable tests for some classes that leak a connection to the
session bus.

https://bugzilla.gnome.org/show_bug.cgi?id=711715

testsuite/gtk/objects-finalize.c

@@ -78,11 +78,28 @@ main (int argc, char **argv)
 {
   const GType *all_types;
   guint n_types = 0, i;
+  gchar *schema_dir;
+  GTestDBus *bus;
+  gint result;
+
+  /* These must be set before before gtk_test_init */
+  g_setenv ("GIO_USE_VFS", "local", TRUE);
+  g_setenv ("GSETTINGS_BACKEND", "memory", TRUE);
 
   /* initialize test program */
   gtk_test_init (&argc, &argv);
   gtk_test_register_all_types ();
 
+  /* g_test_build_filename must be called after gtk_test_init */
+  schema_dir = g_test_build_filename (G_TEST_BUILT, "", NULL);
+  g_setenv ("GSETTINGS_SCHEMA_DIR", schema_dir, TRUE);
+
+  /* Create one test bus for all tests, as we have a lot of very small
+   * and quick tests.
+   */
+  bus = g_test_dbus_new (G_TEST_DBUS_NONE);
+  g_test_dbus_up (bus);
+
   all_types = gtk_test_list_all_types (&n_types);
 
   for (i = 0; i < n_types; i++)
@@ -110,5 +127,11 @@ main (int argc, char **argv)
 	}
     }
 
-  return g_test_run();
+  result = g_test_run();
+
+  g_test_dbus_down (bus);
+  g_object_unref (bus);
+  g_free (schema_dir);
+
+  return result;
 }