@Override
  public Object nextEntry() throws IOException {
    ZipInputStream zis = (ZipInputStream) delegate;
    if ( zis == null ) {
      throw new IOException( INVALID_INPUT_MSG );
    }
    return zis.getNextEntry();
  }
@Test
  public void testNextEntry() throws IOException {
    assertNotNull( createZIPInputStream().getNextEntry() );
  }