LocalCache<?, ?> map = CacheTesting.toLocalCache(cache);
    assertThat(map.segments).hasLength(4); // concurrency level
    assertEquals(4, map.segments[0].table.length()); // capacity / conc level
  }

  @GwtIncompatible // CountDownLatch
  static final class DelayingIdentityLoader<T> extends CacheLoader<T, T> {
    private final AtomicBoolean shouldWait;