builder.put(entry);
    holder.string = "two";
    assertEquals(asList(1), builder.build().get("one"));
  }

  // TODO: test ImmutableMultimap builder and factory methods

  public void testCopyOf() {
    ImmutableSetMultimap<String, String> setMultimap = ImmutableSetMultimap.of("k1", "v1");
    ImmutableMultimap<String, String> setMultimapCopy = ImmutableMultimap.copyOf(setMultimap);

    ImmutableBiMap<String, Integer> copy = ImmutableBiMap.copyOf(singletonMap("one", 1));
    assertMapEquals(copy, "one", 1);
    assertThat(ImmutableBiMap.copyOf(copy)).isSameInstanceAs(copy);
  }

  public void testCopyOf() {
    Map<String, Integer> original = new LinkedHashMap<>();
    original.put("one", 1);
    original.put("two", 2);
    original.put("three", 3);

    assertThat(multimap.get("a")).containsExactly(5, 2).inOrder();
    assertThat(multimap.get("b")).containsExactly(6, 3).inOrder();
  }

  public void testCopyOf() {
    ArrayListMultimap<String, Integer> input = ArrayListMultimap.create();
    input.put("foo", 1);
    input.put("bar", 2);
    input.put("foo", 3);

    assertEquals(
        Collections.reverseOrder(),
        ((ImmutableSortedSet<Integer>) multimap.asMap().get("a")).comparator());
  }

  public void testCopyOf() {
    HashMultimap<String, Integer> input = HashMultimap.create();
    input.put("foo", 1);
    input.put("bar", 2);
    input.put("foo", 3);

    assertMapEquals(copy, "one", 1);
    assertThat(ImmutableSortedMap.copyOf(copy)).isSameInstanceAs(copy);
    assertThat(copy.comparator()).isEqualTo(Ordering.natural());
  }

  public void testCopyOf() {
    Map<String, Integer> original = new LinkedHashMap<>();
    original.put("one", 1);
    original.put("two", 2);
    original.put("three", 3);

    assertThat(multimap.get("a")).containsExactly(5, 2).inOrder();
    assertThat(multimap.get("b")).containsExactly(6, 3).inOrder();
  }

  public void testCopyOf() {
    ArrayListMultimap<String, Integer> input = ArrayListMultimap.create();
    input.put("foo", 1);
    input.put("bar", 2);
    input.put("foo", 3);