assertThat(lowerCase).isNotSameInstanceAs(base16());
    assertThat(lowerCase).isSameInstanceAs(base16().lowerCase());
    testEncodingWithCasing(lowerCase, "foobar", "666f6f626172");
  }

  public void testBase16IgnoreCase() {
    BaseEncoding ignoreCase = base16().ignoreCase();
    assertThat(ignoreCase).isNotSameInstanceAs(base16());

  public void testSerialization() throws Exception {
    AtomicDouble a = new AtomicDouble();
    AtomicDouble b = serialClone(a);
    assertThat(b).isNotSameInstanceAs(a);
    a.set(-22.0);
    AtomicDouble c = serialClone(a);
    assertThat(c).isNotSameInstanceAs(b);
    assertBitEquals(-22.0, a.get());
    assertBitEquals(0.0, b.get());
    assertBitEquals(-22.0, c.get());
    for (double x : VALUES) {

  }

  public void testImpliedFeatures_returnsNewSetInstance() {
    Set<Feature<?>> features = newHashSet(IMPLIES_FOO);
    assertThat(impliedFeatures(features)).isNotSameInstanceAs(features);
  }

  public void testImpliedFeatures_returnsImpliedFeatures() {
    assertThat(impliedFeatures(newHashSet(FOO))).isEmpty();

    ListMultimap<String, Integer> mod = ArrayListMultimap.create();
    ListMultimap<String, Integer> unmod = Multimaps.unmodifiableListMultimap(mod);
    assertThat(unmod).isNotSameInstanceAs(mod);
    assertThat(Multimaps.unmodifiableListMultimap(unmod)).isSameInstanceAs(unmod);
    ImmutableListMultimap<String, Integer> immutable =
        ImmutableListMultimap.of("a", 1, "b", 2, "a", 3);

  }

  public void testCopyOf_copiesImmutableSortedSet() {
    ImmutableSortedSet<String> sortedSet = ImmutableSortedSet.of("a");
    ImmutableSet<String> copy = ImmutableSet.copyOf(sortedSet);
    assertThat(copy).isNotSameInstanceAs(sortedSet);
  }

  // TODO(b/172823566): Use mainline testToImmutableSet once CollectorTester is usable to java7.
  public void testToImmutableSet_java7() {

  }

  public void testCopyOf_copiesImmutableSortedSet() {
    ImmutableSortedSet<String> sortedSet = ImmutableSortedSet.of("a");
    ImmutableSet<String> copy = ImmutableSet.copyOf(sortedSet);
    assertThat(copy).isNotSameInstanceAs(sortedSet);
  }

  public void testToImmutableSet() {
    Collector<String, ?, ImmutableSet<String>> collector = toImmutableSet();
    Equivalence<ImmutableSet<String>> equivalence =

  }

  public void testImpliedFeatures_returnsNewSetInstance() {
    Set<Feature<?>> features = newHashSet(IMPLIES_FOO);
    assertThat(impliedFeatures(features)).isNotSameInstanceAs(features);
  }

  public void testImpliedFeatures_returnsImpliedFeatures() {
    assertThat(impliedFeatures(newHashSet(FOO))).isEmpty();

    assertThat(identity.apply("foo")).isSameInstanceAs("foo");
  }

  public void testIdentity_notSame() {
    Function<Long, Long> identity = Functions.identity();
    assertThat(identity.apply(new Long(135135L))).isNotSameInstanceAs(new Long(135135L));
  }

  @J2ktIncompatible
  @GwtIncompatible // SerializableTester
  public void testIdentitySerializable() {
    checkCanReserializeSingleton(Functions.identity());
  }

    assertDoesntActuallyTrim(iia2);
  }

  private static void assertActuallyTrims(ImmutableIntArray iia) {
    ImmutableIntArray trimmed = iia.trimmed();
    assertThat(trimmed).isNotSameInstanceAs(iia);

    // Yes, this is apparently how you check array equality in Truth
    assertThat(trimmed.toArray()).isEqualTo(iia.toArray());
  }

          .that(instance)
          .isNotNull();
      assertWithMessage("Expected to return fresh instance for: " + mutableClass)
          .that(ArbitraryInstances.get(mutableClass))
          .isNotSameInstanceAs(instance);
    }
  }

  private enum EmptyEnum {}

  private enum Direction {
    UP,
    DOWN
  }

  public interface SomeInterface {}