}
    assertCollectionsAreEquivalent(multiset, copy);

    try {
      multiset.remove(sampleElement, 2);
      fail("remove(Object, int) succeeded on unmodifiable collection");
    } catch (UnsupportedOperationException expected) {
    }
    assertCollectionsAreEquivalent(multiset, copy);

    assertCollectionsAreEquivalent(multiset, copy);