code: @Test public void testKeyword() throws Exception {
  {
      Parser p=new Parser("hello%xyz");
      Node t=p.parse();
      Node witness=new Node(Node.LITERAL,"hello");
      witness.next=new SimpleKeywordNode("xyz");
      assertEquals(witness,t);
    }
  {
      Parser p=new Parser("hello%xyz{x}");
      Node t=p.parse();
      Node witness=new Node(Node.LITERAL,"hello");
      SimpleKeywordNode n=new SimpleKeywordNode("xyz");
      List<String> optionList=new ArrayList<String>();
      optionList.add("x");
      n.setOptions(optionList);
      witness.next=n;
      assertEquals(witness,t);
    }
  }
  