assertEquals(ImmutableSet.of(), ArbitraryInstances.get(ImmutableSet.class));
    assertEquals(ImmutableSortedSet.of(), ArbitraryInstances.get(SortedSet.class));
    assertEquals(ImmutableSortedSet.of(), ArbitraryInstances.get(ImmutableSortedSet.class));
    assertEquals(ImmutableList.of(), ArbitraryInstances.get(Collection.class));

    assertEquals(ImmutableSet.of(), ArbitraryInstances.get(ImmutableSet.class));
    assertEquals(ImmutableSortedSet.of(), ArbitraryInstances.get(SortedSet.class));
    assertEquals(ImmutableSortedSet.of(), ArbitraryInstances.get(ImmutableSortedSet.class));
    assertEquals(ImmutableList.of(), ArbitraryInstances.get(Collection.class));

    assertFreshInstance(new TypeToken<ImmutableSet<String>>() {});
  }

  public void testImmutableSortedSet() {
    assertFreshInstance(new TypeToken<ImmutableSortedSet<String>>() {});
  }

  public void testImmutableMultiset() {
    assertFreshInstance(new TypeToken<ImmutableSortedSet<String>>() {});
    assertNotInstantiable(new TypeToken<ImmutableMultiset<EmptyEnum>>() {});
  }

  public void testImmutableCollection() {

       * ImmutableSet.Builder but y is an ImmutableSortedSet.Builder (or vice versa). Certainly
       * ImmutableSortedSet.Builder.combine() is written as if its argument will never be a plain
       * ImmutableSet.Builder: It casts immediately to ImmutableSortedSet.Builder.)
       */
      copyIfNecessary();
      this.impl = this.impl.combine(other.impl);

        ImmutableMap<String, String> immutableMap,
        Set<String> set,
        ImmutableSet<Integer> immutableSet,
        SortedSet<Number> sortedSet,
        ImmutableSortedSet<Number> immutableSortedSet,
        Multiset<String> multiset,
        ImmutableMultiset<Integer> immutableMultiset,
        Multimap<String, Integer> multimap,
        ImmutableMultimap<String, Integer> immutableMultimap,

  public void testGet_emptyList() {
    testGetOnEmpty(Collections.<String>emptyList());
  }

  public void testGet_sortedSet() {
    testGetOnAbc(ImmutableSortedSet.of("b", "c", "a"));
  }

  public void testGet_emptySortedSet() {
    testGetOnEmpty(ImmutableSortedSet.<String>of());
  }

  public void testGet_iterable() {
    testGetOnAbc(ImmutableSet.of("a", "b", "c"));
  }

   * order in which they appear in the input.
   *
   * <p>If your data has no duplicates, or you wish to deduplicate elements, use {@code
   * ImmutableSortedSet.copyOf(elements)}; if you want a {@code List} you can use its {@code
   * asList()} view.
   *
   * <p><b>Java 8+ users:</b> If you want to convert a {@link java.util.stream.Stream} to a sorted

        () -> map.headMap("r", false).tailMap("m", true).keySet().add("a"));
  }

  @GwtIncompatible // NavigableMap
  public void testAsMapNavigableEmpty() {
    NavigableSet<String> strings = ImmutableSortedSet.of();
    NavigableMap<String, Integer> map = Maps.asMap(strings, LENGTH_FUNCTION);
    assertThat(map.entrySet()).isEmpty();
    assertTrue(map.isEmpty());
    assertThat(map.get("five")).isNull();
  }

        () -> map.headMap("r", false).tailMap("m", true).keySet().add("a"));
  }

  @GwtIncompatible // NavigableMap
  public void testAsMapNavigableEmpty() {
    NavigableSet<String> strings = ImmutableSortedSet.of();
    NavigableMap<String, Integer> map = Maps.asMap(strings, LENGTH_FUNCTION);
    assertThat(map.entrySet()).isEmpty();
    assertTrue(map.isEmpty());
    assertThat(map.get("five")).isNull();
  }