assert_se(sd_bus_message_new_signal(NULL, "/foo/bar", "bar.x", "waldo", &m) >= 0);
assert_se(sd_bus_message_append(m, "ssss", "one", "two", "/prefix/three", "prefix.four") >= 0);
assert_se(sd_bus_message_new_signal(NULL, "/foo/bar", "bar.x", "waldo", &m) >= 0);
assert_se(sd_bus_message_append(m, "ssss", "one", "two", "/prefix/three", "prefix.four") >= 0);