}

  public void testTreeMapNonGeneric() {
    TreeMap<LegacyComparable, Integer> map = Maps.newTreeMap();
    assertEquals(emptyMap(), map);
    map.put(new LegacyComparable("foo"), 1);
    map.put(new LegacyComparable("bar"), 2);
    assertThat(map.keySet())
        .containsExactly(new LegacyComparable("bar"), new LegacyComparable("foo"))
        .inOrder();