E transform(Entry<E> entry) {
        return entry.getElement();
      }
    };
  }

  abstract static class ElementSet<E extends @Nullable Object> extends Sets.ImprovedAbstractSet<E> {
    abstract Multiset<E> multiset();

    @Override
    public void clear() {
      multiset().clear();
    }

    @Override
    public boolean contains(@CheckForNull Object o) {
      return multiset().contains(o);

  public void testClear() {
    table = create("foo", 1, 'a', "bar", 1, 'b', "foo", 3, 'c');
    if (supportsRemove()) {
      table.clear();
      assertEquals(0, table.size());
      assertFalse(table.containsRow("foo"));
    } else {
      assertThrows(UnsupportedOperationException.class, () -> table.clear());
    }
  }

  public void testPut() {
    assertNull(table.put("foo", 1, cellValue('a')));

    table.put("b", "b", "x");
    table.put("b", "c", "y");
    table.put("b", "x", "n");
    table.put("a", "a", "d");
    table.row("b").subMap("c", "x").clear();
    assertEquals(table.row("b"), ImmutableMap.of("b", "x", "x", "n"));
    table.row("b").subMap("b", "y").clear();
    assertEquals(table.row("b"), ImmutableMap.of());
    assertFalse(table.backingMap.containsKey("b"));
  }

        return map.put(o, PRESENT) == null;
    }

    @Override
    public boolean remove(final Object o) {
        return map.remove(o) == PRESENT;
    }

    @Override
    public void clear() {
        map.clear();
    }

        return parent.remove(key);
    }

    @Override
    public void putAll(final Map<? extends String, ? extends Object> m) {
        parent.putAll(m);
    }

    @Override
    public void clear() {
        parent.clear();
    }

    @Override
    public Set<String> keySet() {
        return parent.keySet();
    }

    @Override
    public Collection<Object> values() {
        return parent.values();

    return responseQueue.peek() ?: failFastResponse ?: super.peek()
  }

  open fun enqueueResponse(response: MockResponse) {
    responseQueue.add(response)
  }

  open fun clear() {
    responseQueue.clear()
  }

  override fun shutdown() {
    responseQueue.add(DEAD_LETTER)
  }

  open fun setFailFast(failFast: Boolean) {
    val failFastResponse =
      if (failFast) {

    public boolean containsValue(@Nullable Object value) {
      assertTrue(Thread.holdsLock(mutex));
      return delegate.containsValue(value);
    }

    @Override
    public void clear() {
      assertTrue(Thread.holdsLock(mutex));
      delegate.clear();
    }

    @Override
    public Collection<V> values() {
      assertTrue(Thread.holdsLock(mutex));
      /* TODO: verify that the Collection is also synchronized? */

    @Override
    public boolean addAll(final int index, final Collection<? extends Map<String, Object>> c) {
        return parent.addAll(index, c);
    }

    @Override
    public void clear() {
        parent.clear();
    }

    @Override
    public boolean contains(final Object o) {
        return parent.contains(o);
    }

    @Override
    public boolean containsAll(final Collection<?> c) {

      if (occurrences >= oldCount) {
        values.clear();
      } else {
        Iterator<V> iterator = values.iterator();
        for (int i = 0; i < occurrences; i++) {
          iterator.next();
          iterator.remove();
        }
      }
      return oldCount;
    }

    @Override
    public void clear() {
      multimap.clear();
    }

    @Override

    assertEquals(expected, copyToList(sortedMultiset.entrySet()));
  }

  @CollectionSize.Require(SEVERAL)
  @CollectionFeature.Require(SUPPORTS_REMOVE)
  public void testClearHeadOpen() {
    List<Entry<E>> expected =
        copyToList(sortedMultiset.tailMultiset(b.getElement(), CLOSED).entrySet());
    sortedMultiset.headMultiset(b.getElement(), OPEN).clear();