public byte[] getXAttr(Path path, String name) throws IOException {
    return retrieveHeaders(path, INVOCATION_XATTR_GET_NAMED).get(name);
  }
@Test
  public void test404() throws Throwable {
    intercept(FileNotFoundException.class, () ->
        headerProcessing.getXAttr(new Path(FINAL_FILE), XA_MAGIC_MARKER));
  }