@Override
    public void writeCharacters(char[] text, int start, int len) throws XMLStreamException {
        nonXmlCharFilterer.filter(text, start, len);
        writer.writeCharacters(text, start, len);
    }
@Test
    public void testWriteCharacters3Args() throws XMLStreamException {
        char[] buffer = new char[] { 'a', 'b', 'c' };
        filteringXmlStreamWriter.writeCharacters(buffer, 2, 3);
        verify(xmlStreamWriterMock).writeCharacters(same(buffer), eq(2), eq(3));
    }