#unittest {
    name: "List sort.";
    result: true;
};

func main() {
  func predicate(a, b) {
    return a > b
  }
  var list = [4, 6, 1, 2, 4]
  list.sort(predicate)
  if (list.String() != [1, 2, 4, 4, 6].String()) {
    return false
  }
  var list2 = []
  list2.sort(predicate)
  if (list2.String() != [].String()) {
    return false
  }
  var list3 = [1,2,3,4,5,6,7]
  list3.sort(predicate)
  if (list3.String() != [1,2,3,4,5,6,7].String()) {
    return false
  }
  var list4 = [-1, -5, 300, -40, 20]
  list4.sort(predicate)
  if (list4.String() != [-40, -5, -1, 20, 300].String()) {
    return false
  }
  var list5 = [-3]
  list5.sort(predicate)
  if (list5.String() != [-3].String()) {
    return false
  }
  return true
}