svoid test_toLines_nOnly_reversible() {
  testFunctionValues toLines_nOnly_reversible(
    "", ll(),
    "abc", ll("abc"),
    "\n", ll("", ""),
    "abc\n", ll("abc", ""),
    "abc\r\n", ll("abc\r", ""),
    "\nbla", ll("", "bla"),
    "\nbla\r", ll("", "bla\r"),
  );
}