@Test
public void headline() {

    /* prepare */
    String line = "== headline";
    /* execute */
    List<AsciidocFormatBlock> result = scannerToTest.scan(line);
    /* test */
    assertNotNull(result);
    assertEquals(1,result.size());
    AsciidocFormatBlock n = result.iterator().next();
    assertEquals(AsciidocBlockType.HEADLINE, n.blockType);
    assertEquals("== headline", n.source.toString());
    assertSourcesAddedLikeOrigin(result,line);
}