This is a testharness.js-based test.
Found 4 FAIL, 0 TIMEOUT, 0 NOTRUN.
[FAIL] Concatenating two ISO-2022-JP outputs is not always valid
  assert_equals: expected "¥\\ufffd¥" but got "\\ufffd¥\\ufffd¥"
[FAIL] Replacement, push back ASCII characters: iso-2022-jp
  assert_equals: expected "\\ufffd\\ufffd" but got "\\ufffd$"
[FAIL] Sticky multibyte state: iso-2022-jp
  assert_equals: expected "@" but got "\\ufffd@"
[FAIL] Sticky multibyte state: euc-jp
  assert_equals: expected "　" but got "\\ufffd"
Harness: the test ran to completion.