How to use

LT

method

in

org.antlr.v4.runtime.CommonTokenStream

@Test
public void test(){
  CommonTokenStream ts = TokenStreamFactory.createTokenStream("class{    }");
  int tokenSize = ts.size();
  assertEquals(0, tokenSize);
  List<Token> tokens = ts.getTokens();
  assertEquals(0, tokens.size());
  ts.consume();
  ts.consume();
  assertEquals("}", ts.LT(1).getText());
  assertEquals("{", ts.LT(-1).getText());
  assertEquals("class", ts.LT(-2).getText());
  //why is it 4?
  assertEquals(4, ts.size());
  int consumeSize = 2;
  while(ts.LA(1)!=IntStream.EOF){
    ts.consume();
    consumeSize++;
  }
  tokens = ts.getTokens();
  assertEquals(5, tokens.size());
  assertEquals(3, consumeSize);
}