      [ 0xfffd, 0xfffd, 0xfffd, 0x0041 ],
      [ 0x41, 0xed, 0xa0, 0x80, 0x41 ]))

  // U+DB40
  expectTrue(checkDecodeUTF8(
      [],
      [ 0xfffd, 0xfffd, 0xfffd ],
      [ 0xed, 0xac, 0xa0 ]))

  // U+DBFF
  expectTrue(checkDecodeUTF8(
      [],
      [ 0xfffd, 0xfffd, 0xfffd ],