ImmutableSortedSet.Builder<String> zis =
        ImmutableSortedSet.<String>naturalOrder().add("c", "b", "c");
    ImmutableSortedSet.Builder<String> zat =
        ImmutableSortedSet.<String>naturalOrder().add("a", "b", "d", "c");
    ImmutableSortedSet<String> sortedSet = zis.combine(zat).build();
    assertThat(sortedSet).containsExactly("a", "b", "c", "d").inOrder();
  }

  public void testToImmutableBiMap_java7_combine() {
    ImmutableBiMap.Builder<String, Integer> zis =
        ImmutableBiMap.<String, Integer>builder().put("one", 1);
    ImmutableBiMap.Builder<String, Integer> zat =
        ImmutableBiMap.<String, Integer>builder().put("two", 2).put("three", 3);
    ImmutableBiMap<String, Integer> biMap = zis.combine(zat).build();
    assertMapEquals(biMap, "one", 1, "two", 2, "three", 3);
  }

  public void testToImmutableSet_java7() {
    ImmutableSet.Builder<String> zis = ImmutableSet.<String>builder().add("a", "b", "a");
    ImmutableSet.Builder<String> zat = ImmutableSet.<String>builder().add("c", "b", "d", "c");
    ImmutableSet<String> set = zis.combine(zat).build();
    assertThat(set).containsExactly("a", "b", "c", "d").inOrder();
  }

  @Override

    ImmutableListMultimap.Builder<String, Integer> zis =
        ImmutableListMultimap.<String, Integer>builder().put("a", 1).put("b", 2);
    ImmutableListMultimap.Builder<String, Integer> zat =
        ImmutableListMultimap.<String, Integer>builder().put("a", 3).put("c", 4);
    ImmutableListMultimap<String, Integer> multimap = zis.combine(zat).build();

  public void testToImmutableList_java7_combine() {
    ImmutableList.Builder<String> zis = ImmutableList.<String>builder().add("a", "b");
    ImmutableList.Builder<String> zat = ImmutableList.<String>builder().add("c", "d");
    ImmutableList<String> list = zis.combine(zat).build();
    assertEquals(asList("a", "b", "c", "d"), list);
  }

  // Basic tests

  @J2ktIncompatible