public void testReplaceValuesWithEmpty() {
    int size = multimap().size();
    List<V> oldValues = new ArrayList<>(multimap().get(k0()));
    List<V> values = emptyList();
    assertEquals(oldValues, new ArrayList<V>(multimap().replaceValues(k0(), values)));
    assertGet(k0());
    assertEquals(size - oldValues.size(), multimap().size());
  }

  @MapFeature.Require({SUPPORTS_PUT, SUPPORTS_REMOVE})

  public void testReplaceValuesWithEmpty() {
    int size = multimap().size();
    List<V> oldValues = new ArrayList<>(multimap().get(k0()));
    List<V> values = emptyList();
    assertEquals(oldValues, new ArrayList<V>(multimap().replaceValues(k0(), values)));
    assertGet(k0());
    assertEquals(size - oldValues.size(), multimap().size());
  }

  @MapFeature.Require({SUPPORTS_PUT, SUPPORTS_REMOVE})

        } else {
            final Object oldValue = dataMap.get(key);
            final Object[] oldValues;
            if (oldValue instanceof Object[]) {
                oldValues = (Object[]) oldValue;
            } else if (oldValue instanceof Collection<?>) {
                oldValues = ((Collection<?>) oldValue).toArray();
            } else {
                oldValues = new Object[] { oldValue };
            }

        // Test that putValues overwrites existing values
        ExtractData data = new ExtractData();

        data.putValue("key", "old_value");
        String[] oldValues = data.getValues("key");
        assertEquals(1, oldValues.length);
        assertEquals("old_value", oldValues[0]);

        String[] newValues = { "new_value1", "new_value2" };
        data.putValues("key", newValues);

     * But that check wouldn't eliminate the warnings.)
     */
    @SuppressWarnings({"unchecked", "nullness"})
    K castKey = (K) key;
    List<V> oldValues = getCopy(castKey);
    removeAllNodes(castKey);
    return oldValues;
  }

  @Override
  public void clear() {
    head = null;
    tail = null;
    keyToKeyList.clear();
    size = 0;
    modCount++;
  }

    Collection<V> oldValues = createCollection();
    oldValues.addAll(collection);

    totalSize -= collection.size();
    collection.clear();

    while (iterator.hasNext()) {
      if (collection.add(iterator.next())) {
        totalSize++;
      }
    }

    return unmodifiableCollectionSubclass(oldValues);
  }

  /**
   * {@inheritDoc}
   *

    segment.setWeakValueReferenceForTesting(entry, oldValueRef);

    // no entry
    assertFalse(segment.replace(key, hash, oldValue, newValue));
    assertEquals(0, segment.count);

    // same value
    segment.setTableEntryForTesting(index, entry);
    segment.count++;
    assertEquals(1, segment.count);
    assertSame(oldValue, segment.get(key, hash));

    segment.setWeakValueReferenceForTesting(entry, oldValueRef);

    // no entry
    assertFalse(segment.replace(key, hash, oldValue, newValue));
    assertEquals(0, segment.count);

    // same value
    segment.setTableEntryForTesting(index, entry);
    segment.count++;
    assertEquals(1, segment.count);
    assertSame(oldValue, segment.get(key, hash));

    V oldValue = uncheckedCastNullableTToT(delegate.remove(key));
    removeFromInverseMap(oldValue);
    return oldValue;
  }

  private void removeFromInverseMap(@ParametricNullness V oldValue) {
    inverse.delegate.remove(oldValue);
  }

  // Bulk Operations

  @Override
  public void putAll(Map<? extends K, ? extends V> map) {

    Set<Entry<K, V>> entrySet = map.entrySet();
    Entry<K, V> entry = entrySet.iterator().next();
    V oldValue = entry.getValue();
    V returnedValue = entry.setValue(oldValue);
    assertEquals(oldValue, returnedValue);
    assertTrue(entrySet.contains(mapEntry(entry.getKey(), oldValue)));
    assertEquals(oldValue, map.get(entry.getKey()));
    assertInvariants(map);
  }

  public void testEqualsForEqualMap() {