* @author Louis Wasserman
 */
@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)