static class StrongKeyStrongValueEntry<K, V>
      extends AbstractStrongKeyEntry<K, V, StrongKeyStrongValueEntry<K, V>>
      implements StrongValueEntry<K, V, StrongKeyStrongValueEntry<K, V>> {
    private volatile @Nullable V value = null;

    private StrongKeyStrongValueEntry(K key, int hash) {
      super(key, hash);
    }

    @Override

    assertSame(map.valueStrength().defaultEquivalence(), map.valueEquivalence());

    assertThat(map.entryHelper)
        .isInstanceOf(MapMakerInternalMap.StrongKeyStrongValueEntry.Helper.class);

    assertEquals(4, map.concurrencyLevel);

    // concurrency level
    assertThat(map.segments).hasLength(4);
    // initial capacity / concurrency level

    assertSame(map.valueStrength().defaultEquivalence(), map.valueEquivalence());

    assertThat(map.entryHelper)
        .isInstanceOf(MapMakerInternalMap.StrongKeyStrongValueEntry.Helper.class);

    assertEquals(4, map.concurrencyLevel);

    // concurrency level
    assertThat(map.segments).hasLength(4);
    // initial capacity / concurrency level