new AsciidoctorInvoker().invoke("-a", "linkcss!", "target/test-classes/rendersample.asciidoc");
File expectedFile = new File("target/test-classes/rendersample.html");
Document doc = Jsoup.parse(expectedFile, "UTF-8");
Elements cssStyle = doc.select("style");
assertThat(cssStyle.html(), is(not("")));
Elements link = doc.select("link");
assertThat(link.html(), is("".trim()));
expectedFile.delete();