}
    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);

    } catch (UnsupportedOperationException expected) {
    }

    assertCollectionsAreEquivalent(copy, collection);

    try {
      collection.addAll(siblingCollection);
      fail("addAll succeeded on unmodifiable collection");
    } catch (UnsupportedOperationException expected) {
    }
    assertCollectionsAreEquivalent(copy, collection);

    try {
      collection.clear();