@Test
    public void testNPEInPDFParserConfig() {
        //TIKA-3091
        PDFParserConfig config = new PDFParserConfig();
        //don't care about values; want to make sure no NPE is thrown
        String txt = config.toString();
        config.hashCode();
        config.equals(new PDFParserConfig());
    }
Test to ensure that Links are extracted from the text
<p/>
Note - the PDF contains the text "This is a hyperlink" which
a hyperlink annotation, linking to the tika site, on it. This
test will need updating when we're able to apply the annotation
to the text itself, rather than following on afterwards as now
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-pdf-module/src/test/java/org/apache/tika/parser/pdf/PDFParserTest.java