assertEquals(c, ImmutableMultiset.of("a", "b", "a"));
    assertEquals(c, ImmutableMultiset.of("a", "a", "b"));
    assertThat(c).isNotEqualTo(ImmutableMultiset.of("a", "b"));
    assertThat(c).isNotEqualTo(ImmutableMultiset.of("a", "b", "c", "d"));
  }

  public void testIterationOrder() {
    Collection<String> c = ImmutableMultiset.of("a", "b", "a");

    assertEquals(c, ImmutableMultiset.of("a", "b", "a"));
    assertEquals(c, ImmutableMultiset.of("a", "a", "b"));
    assertThat(c).isNotEqualTo(ImmutableMultiset.of("a", "b"));
    assertThat(c).isNotEqualTo(ImmutableMultiset.of("a", "b", "c", "d"));
  }

  public void testIterationOrder() {
    Collection<String> c = ImmutableMultiset.of("a", "b", "a");

      assertThat(expected).hasMessageThat().matches(pattern);
      Matcher matcher = pattern.matcher(expected.getMessage());
      assertThat(matcher.matches()).isTrue();
      assertThat(matcher.group(1)).isNotEqualTo(matcher.group(2));
    }
  }

  public void testOf() {
    assertMapEquals(ImmutableMap.of("one", 1), "one", 1);
    assertMapEquals(ImmutableMap.of("one", 1, "two", 2), "one", 1, "two", 2);

  // valid result thrown by java.util.TreeSet#equals.
  private static void assertNotEqualLenient(TreeSet<?> unexpected, SortedSet<?> actual) {
    try {
      assertThat(actual).isNotEqualTo(unexpected);
    } catch (ClassCastException accepted) {
    }
  }

  public void testHeadSetInclusive() {
    String[] strings = NUMBER_NAMES.toArray(new String[0]);

      assertThat(expected).hasMessageThat().matches(pattern);
      Matcher matcher = pattern.matcher(expected.getMessage());
      assertThat(matcher.matches()).isTrue();
      assertThat(matcher.group(1)).isNotEqualTo(matcher.group(2));
    }
  }

  public void testOf() {
    assertMapEquals(ImmutableMap.of("one", 1), "one", 1);
    assertMapEquals(ImmutableMap.of("one", 1, "two", 2), "one", 1, "two", 2);

  // valid result thrown by java.util.TreeSet#equals.
  private static void assertNotEqualLenient(TreeSet<?> unexpected, SortedSet<?> actual) {
    try {
      assertThat(actual).isNotEqualTo(unexpected);
    } catch (ClassCastException accepted) {
    }
  }

  public void testHeadSetInclusive() {
    String[] strings = NUMBER_NAMES.toArray(new String[0]);