g_object_set (badger1, "mama", badger2, NULL);
g_assert_cmpuint (badger1->mama_notify_count, ==, 1);
g_assert_cmpuint (badger2->mama_notify_count, ==, 1);
g_object_set (badger1, "mama", badger2, NULL);
g_assert_cmpuint (badger1->mama_notify_count, ==, 1);
g_assert_cmpuint (badger2->mama_notify_count, ==, 1);