assertEquals(oldValues, new ArrayList<V>(multimap().replaceValues(k0(), values)));
    assertEquals(size - oldValues.size() + multimap().get(k0()).size(), multimap().size());
    assertTrue(multimap().get(k0()).containsAll(values));
  }

  @CollectionSize.Require(absent = ZERO)
  @MapFeature.Require({SUPPORTS_PUT, SUPPORTS_REMOVE})
  public void testReplaceNonEmptyValues() {
    List<K> keys = Helpers.copyToList(multimap().keySet());

    public void clear() {
      standardClear();
    }

    @Override
    public boolean contains(Object object) {
      return standardContains(object);
    }

    @Override
    public boolean containsAll(Collection<?> collection) {
      return standardContainsAll(collection);
    }

    @Override
    public boolean remove(Object object) {
      return standardRemove(object);
    }

    @Override

  }

  @Override
  public boolean containsAll(Collection<?> targets) {
    for (Object target : targets) {
      if (target == null) {
        // This set never contains null.  We need to explicitly check here
        // because some comparator might throw NPE (e.g. the natural ordering).
        return false;
      }
    }
    try {
      return sortedDelegate.containsAll(targets);
    } catch (ClassCastException e) {

    assertEquals(oldValues, new ArrayList<V>(multimap().replaceValues(k0(), values)));
    assertEquals(size - oldValues.size() + multimap().get(k0()).size(), multimap().size());
    assertTrue(multimap().get(k0()).containsAll(values));
  }

  @CollectionSize.Require(absent = ZERO)
  @MapFeature.Require({SUPPORTS_PUT, SUPPORTS_REMOVE})
  public void testReplaceNonEmptyValues() {
    List<K> keys = Helpers.copyToList(multimap().keySet());

    public boolean contains(@CheckForNull Object o) {
      refreshIfEmpty();
      return delegate.contains(o);
    }

    @Override
    public boolean containsAll(Collection<?> c) {
      refreshIfEmpty();
      return delegate.containsAll(c);
    }

    @Override
    public void clear() {
      int oldSize = size(); // calls refreshIfEmpty
      if (oldSize == 0) {
        return;
      }

      public boolean contains(@CheckForNull Object object) {
        return set1.contains(object) && set2.contains(object);
      }

      @Override
      public boolean containsAll(Collection<?> collection) {
        return set1.containsAll(collection) && set2.containsAll(collection);
      }
    };
  }

  /**
   * Returns an unmodifiable <b>view</b> of the difference of two sets. The returned set contains

    public void clear() {
      standardClear();
    }

    @Override
    public boolean contains(Object object) {
      return standardContains(object);
    }

    @Override
    public boolean containsAll(Collection<?> collection) {
      return standardContainsAll(collection);
    }

    @Override
    public boolean remove(Object object) {
      return standardRemove(object);
    }

    @Override

      standardClear();
    }

    @Override
    public boolean contains(@Nullable Object object) {
      return standardContains(object);
    }

    @Override
    public boolean containsAll(Collection<?> collection) {
      return standardContainsAll(collection);
    }

    @Override
    public boolean isEmpty() {
      return standardIsEmpty();
    }

    @Override

            return parent.add(e);
        }

        public boolean remove(final Object o) {
            return parent.remove(o);
        }

        public boolean containsAll(final Collection<?> c) {
            return parent.containsAll(c);
        }

        public boolean addAll(final Collection<? extends E> c) {
            return parent.addAll(c);
        }

            return parent.add(e);
        }

        public boolean remove(final Object o) {
            return parent.remove(o);
        }

        public boolean containsAll(final Collection<?> c) {
            return parent.containsAll(c);
        }

        public boolean addAll(final Collection<? extends E> c) {
            return parent.addAll(c);
        }