svoid test_charIndexToCharInToken() {
  LS tok = javaTok("hello world");
  assertEqualsVerbose(CharInToken(tok, 1, 0), charIndexToCharInToken(tok, 0));
  assertEqualsVerbose(CharInToken(tok, 1, 1), charIndexToCharInToken(tok, 1));
  assertEqualsVerbose(CharInToken(tok, 2, 0), charIndexToCharInToken(tok, 5));
  assertEqualsVerbose(CharInToken(tok, 3, 0), charIndexToCharInToken(tok, 6));
  
  tok = javaTok("add ");
  assertEqualsVerbose(CharInToken(tok, 3, 0), charIndexToCharInToken(tok, 4));
}