TreeMultimap<@Nullable String, @Nullable Integer> multimap = createPopulate();
    assertEquals(StringLength.COMPARATOR, multimap.keyComparator());
    assertEquals(DECREASING_INT_COMPARATOR, multimap.valueComparator());
  }

  public void testOrderedGet() {
    TreeMultimap<@Nullable String, @Nullable Integer> multimap = createPopulate();
    assertThat(multimap.get(null)).containsExactly(7, 3, 1).inOrder();

    TreeMultimap<String, Integer> multimap = createPopulate();
    assertThat(multimap.get("foo")).containsExactly(1, 3, 7).inOrder();
    assertThat(multimap.get("google")).containsExactly(2, 6).inOrder();
    assertThat(multimap.get("tree")).containsExactly(0, 4).inOrder();
  }

  public void testOrderedKeySet() {
    TreeMultimap<String, Integer> multimap = createPopulate();