@Test
 public void shouldExtractIllustrationPath() throws Exception {
   String content =
       "[part \"parte um\" illustration=resources/image.png]\n"
           + "[chapter capitulo um]\n"
           + "introducao do capitulo um\n"
           + "[section secao um]\n"
           + "conteudo da secao um";
   assertTrue(extractor.containsIllustration(content));
   assertEquals("resources/image.png", extractor.extractIllustrationPathFrom(content));
 }
 @Test
 public void shouldNotFindPart() throws Exception {
   String content =
       "[chapter capitulo um]\n"
           + "introducao do capitulo um\n"
           + "[section secao um]\n"
           + "conteudo da secao um";
   assertFalse(extractor.containsPartTag(content));
 }
 @Test
 public void shouldFindPart() throws Exception {
   String content =
       "[part \"parte um\" illustration=resources/image.png]\n"
           + "[chapter capitulo um]\n"
           + "introducao do capitulo um\n"
           + "[section secao um]\n"
           + "conteudo da secao um";
   assertTrue(extractor.containsPartTag(content));
 }