@Test
    public void testPPTXChartData() throws Exception {
        String xml = getXML("testPPT_charts.pptx", parseContext).xml;
        assertContains("peach", xml);
        assertContains("March\tApril", xml);
        assertNotContained("chartSpace", xml);
    }
TIKA-712 Master Slide Text from PPT and PPTX files
should be extracted too
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/test/java/org/apache/tika/parser/microsoft/ooxml/SXSLFExtractorTest.java