*/
  @SuppressWarnings("unchecked")
  public static <E extends @Nullable Object> TreeMultiset<E> create(
      @Nullable Comparator<? super E> comparator) {
    return (comparator == null)
        ? new TreeMultiset<E>((Comparator) Ordering.natural())
        : new TreeMultiset<E>(comparator);
  }

  /**
   * Creates an empty multiset containing the given initial elements, sorted according to the

  }

  public void testToString() {
    Multiset<String> ms = TreeMultiset.create();
    ms.add("a", 3);
    ms.add("c", 1);
    ms.add("b", 2);

    assertEquals("[a x 3, b x 2, c]", ms.toString());
  }

  public void testElementSetSortedSetMethods() {
    TreeMultiset<String> ms = TreeMultiset.create();
    ms.add("c", 1);
    ms.add("a", 3);
    ms.add("b", 2);

@GwtCompatible
@NullMarked
public class MultisetsTest extends TestCase {

  /* See MultisetsImmutableEntryTest for immutableEntry() tests. */

  public void testNewTreeMultisetDerived() {
    TreeMultiset<DerivedComparable> set = TreeMultiset.create();
    assertTrue(set.isEmpty());
    set.add(new DerivedComparable("foo"), 2);
    set.add(new DerivedComparable("bar"), 3);
    assertThat(set)
        .containsExactly(

    assertEquals(HashMultiset.create(asList("a", "b", "b", "b", "c")), multiset);
  }

  public void testBuilderAddAllTreeMultiset() {
    Multiset<String> a = TreeMultiset.create(asList("a", "b", "b"));
    Multiset<String> b = TreeMultiset.create(asList("c", "b"));
    ImmutableMultiset<String> multiset =
        new ImmutableMultiset.Builder<String>().addAll(a).addAll(b).build();

    assertEquals(HashMultiset.create(asList("a", "b", "b", "b", "c")), multiset);
  }

  public void testBuilderAddAllTreeMultiset() {
    Multiset<String> a = TreeMultiset.create(asList("a", "b", "b"));
    Multiset<String> b = TreeMultiset.create(asList("c", "b"));
    ImmutableMultiset<String> multiset =
        new ImmutableMultiset.Builder<String>().addAll(a).addAll(b).build();

  }

  enum SortedMultisetImpl implements CollectionsImplEnum {
    TreeMultisetImpl {
      @Override
      public <E extends Comparable<E>> SortedMultiset<E> create(Collection<E> contents) {
        return TreeMultiset.create(contents);
      }
    },
    ImmutableSortedMultisetImpl {
      @Override
      public <E extends Comparable<E>> SortedMultiset<E> create(Collection<E> contents) {