assertFalse(Assignability.of().isAssignable());
    assertTrue(new Assignability<Integer, Integer>() {}.isAssignable());
    assertTrue(new Assignability<Integer, Object>() {}.isAssignable());
    assertFalse(new Assignability<Integer, String>() {}.isAssignable());
    TypeTokenTest.<Number, Integer>assignabilityTestWithTypeVariables();
  }

  }

  public void testSampleCode() {
    Iterable<Integer> actual =
        new Iterable<Integer>() {
          @Override
          public Iterator<Integer> iterator() {
            Iterator<Integer> powersOfTwo =
                new AbstractSequentialIterator<Integer>(1) {
                  @Override
                  protected @Nullable Integer computeNext(Integer previous) {

    ImmutableListMultimap<String, Integer> multimap =
        new Builder<String, Integer>().put(Maps.immutableEntry("one", 1)).build();
    assertEquals(Arrays.asList(1), multimap.get("one"));
  }

  public void testBuilder_withImmutableEntryAndNullContents() {
    Builder<String, Integer> builder = new Builder<>();
    try {
      builder.put(Maps.immutableEntry("one", (Integer) null));
      fail();

    doTestToArrayImpl2(Lists.<@Nullable Integer>newArrayList(1, null, 3), new Integer[2], false);
    doTestToArrayImpl2(Lists.<@Nullable Integer>newArrayList(1, null, 3), new Integer[3], true);
  }

  private void doTestToArrayImpl2(List<Integer> list, Integer[] array1, boolean expectModify) {
    Integer[] starting = Arrays.copyOf(array1, array1.length);

    Collection<List<Integer>> permutationSet =
        Collections2.permutations(Collections.<Integer>emptyList());

    assertEquals(1, permutationSet.size());
    assertTrue(permutationSet.contains(Collections.<Integer>emptyList()));

    Iterator<List<Integer>> permutations = permutationSet.iterator();
    assertNextPermutation(Collections.<Integer>emptyList(), permutations);

    Collection<List<Integer>> permutationSet =
        Collections2.permutations(Collections.<Integer>emptyList());

    assertEquals(1, permutationSet.size());
    assertTrue(permutationSet.contains(Collections.<Integer>emptyList()));

    Iterator<List<Integer>> permutations = permutationSet.iterator();
    assertNextPermutation(Collections.<Integer>emptyList(), permutations);

    ListMultimap<String, Integer> a =
        MultimapBuilder.hashKeys().arrayListValues().<String, Integer>build();
    SortedSetMultimap<String, Integer> b =
        rawtypeToWildcard(MultimapBuilder.linkedHashKeys().treeSetValues())
            .<String, Integer>build();
    SetMultimap<String, Integer> c =
        MultimapBuilder.treeKeys(String.CASE_INSENSITIVE_ORDER)
            .hashSetValues()
            .<String, Integer>build();
  }

    ListMultimap<String, Integer> multimap = create();
    multimap.put("foo", 2);
    multimap.put("bar", 3);
    Collection<Entry<String, Integer>> entries = multimap.entries();
    Iterator<Entry<String, Integer>> iterator = entries.iterator();
    Entry<String, Integer> entrya = iterator.next();
    Entry<String, Integer> entryb = iterator.next();

                Maps.immutableEntry("cat", (Collection<Integer>) Sets.newHashSet(12, 13, 14))));
    new IteratorTester<Entry<String, Collection<Integer>>>(
        6, MODIFIABLE, set, IteratorTester.KnownOrder.KNOWN_ORDER) {
      private @Nullable Multimap<String, Integer> multimap;

      @Override
      protected Iterator<Entry<String, Collection<Integer>>> newTargetIterator() {

  }

  public void testComplexBuilder() {
    List<Integer> colorElem = asList(0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF);
    ImmutableList.Builder<Integer> webSafeColorsBuilder = ImmutableList.builder();
    for (Integer red : colorElem) {
      for (Integer green : colorElem) {
        for (Integer blue : colorElem) {
          webSafeColorsBuilder.add((red << 16) + (green << 8) + blue);
        }