svoid test_AscendingOrderIntObjectMap() {
  new AscendingOrderIntObjectMap<S> map;
  assertEqualsVerbose(null, map.get(2));
  map.put(2, "hello");
  assertEqualsVerbose("hello", map.get(2));
  assertEqualsVerbose(null, map.get(5));
  assertEqualsVerbose(null, map.get(10));
  map.put(5, "world");
  assertEqualsVerbose("hello", map.get(2));
  assertEqualsVerbose("world", map.get(5));
  assertEqualsVerbose(null, map.get(10));
  map.put(10, "yo");
  assertEqualsVerbose("hello", map.get(2));
  assertEqualsVerbose("world", map.get(5));
  assertEqualsVerbose("yo", map.get(10));
}