* Test getMessageByDcerpcError() with an unknown error code.
     */
    @Test
    void testGetMessageByDcerpcError_unknownCode() {
        int unknownCode = 0x99999999;
        String message = DcerpcException.getMessageByDcerpcError(unknownCode);
        assertEquals("0x99999999", message, "Should return hex string for unknown error code.");
    }

    /**
     * Test getMessageByDcerpcError() with an error code smaller than any known.

    assertNull(Punycode.decode("xn--cat-ñ3h"))
  }

  @Test fun unterminatedCodePoint() {
    assertNull(Punycode.decode("xn--cat-n"))
  }

  @Test fun overflowI() {
    assertNull(Punycode.decode("xn--99999999"))
  }

  @Test fun overflowMaxCodePoint() {
    assertNull(Punycode.decode("xn--a-b.net"))
    assertNull(Punycode.decode("xn--a-9b.net"))
    assertEquals("a՚.net", Punycode.decode("xn--a-99b.net"))