}

  @GwtIncompatible // NavigableSet
  public void testUnmodifiableNavigableSet() {
    TreeSet<Integer> mod = Sets.newTreeSet();
    mod.add(1);
    mod.add(2);
    mod.add(3);

    NavigableSet<Integer> unmod = unmodifiableNavigableSet(mod);

    /* Unmodifiable is a view. */
    mod.add(4);
    assertTrue(unmod.contains(4));
    assertTrue(unmod.descendingSet().contains(4));

  @GwtIncompatible // NavigableMap
  public void testUnmodifiableNavigableMap() {
    TreeMap<Integer, String> mod = Maps.newTreeMap();
    mod.put(1, "one");
    mod.put(2, "two");
    mod.put(3, "three");

    NavigableMap<Integer, String> unmod = unmodifiableNavigableMap(mod);

    /* unmod is a view. */
    mod.put(4, "four");
    assertEquals("four", unmod.get(4));

  @GwtIncompatible // NavigableMap
  public void testUnmodifiableNavigableMap() {
    TreeMap<Integer, String> mod = Maps.newTreeMap();
    mod.put(1, "one");
    mod.put(2, "two");
    mod.put(3, "three");

    NavigableMap<Integer, String> unmod = unmodifiableNavigableMap(mod);

    /* unmod is a view. */
    mod.put(4, "four");
    assertEquals("four", unmod.get(4));

      // we should get an ExecutionException; if we call getUnchecked(), we should get an
      // UncheckedExecutionException.
      int mod = i % 3;
      if (mod == 0 || mod == 2) {
        assertThat(result.get(i)).isInstanceOf(ExecutionException.class);
        assertThat((ExecutionException) result.get(i)).hasCauseThat().isSameInstanceAs(e);
      } else {

  }

  @SuppressWarnings("deprecation")
  public void testUnmodifiableIteratorShortCircuit() {
    Iterator<String> mod = Lists.newArrayList("a", "b", "c").iterator();
    UnmodifiableIterator<String> unmod = Iterators.unmodifiableIterator(mod);
    assertNotSame(mod, unmod);
    assertSame(unmod, Iterators.unmodifiableIterator(unmod));
    assertSame(unmod, Iterators.unmodifiableIterator((Iterator<String>) unmod));

      // we should get an ExecutionException; if we call getUnchecked(), we should get an
      // UncheckedExecutionException.
      int mod = i % 3;
      if (mod == 0 || mod == 2) {
        assertThat(result.get(i)).isInstanceOf(ExecutionException.class);
        assertThat((ExecutionException) result.get(i)).hasCauseThat().isSameInstanceAs(e);
      } else {

  }

  @SuppressWarnings("deprecation")
  public void testUnmodifiableIteratorShortCircuit() {
    Iterator<String> mod = Lists.newArrayList("a", "b", "c").iterator();
    UnmodifiableIterator<String> unmod = Iterators.unmodifiableIterator(mod);
    assertNotSame(mod, unmod);
    assertSame(unmod, Iterators.unmodifiableIterator(unmod));
    assertSame(unmod, Iterators.unmodifiableIterator((Iterator<String>) unmod));

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