assertThrows(IllegalStateException.class, () -> builder.initialCapacity(16));
  }

  @GwtIncompatible // CacheTesting
  public void testInitialCapacity_small() {
    LoadingCache<?, ?> cache = CacheBuilder.newBuilder().initialCapacity(5).build(identityLoader());
    LocalCache<?, ?> map = CacheTesting.toLocalCache(cache);

    assertThat(map.segments).hasLength(4);