import java.util.Random;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReferenceArray;
import java.util.logging.LogRecord;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.jspecify.annotations.NullUnmarked;

    @Nullable E copyEntry(E original, E newNext) {
      return this.map.entryHelper.copy(self(), original, newNext);
    }

    AtomicReferenceArray<E> newEntryArray(int size) {
      return new AtomicReferenceArray<>(size);
    }

    void initTable(AtomicReferenceArray<E> newTable) {
      this.threshold = newTable.length() * 3 / 4; // 0.75
      this.table = newTable;
    }

   * AtomicReferenceArray of size 2^k. To map a user key into a stripe, we take a k-bit slice of the
   * user key's (smeared) hashCode(). The stripes are lazily initialized and are weakly referenced.
   */
  @VisibleForTesting
  static final class SmallLazyStriped<L> extends PowerOfTwoStriped<L> {
    final AtomicReferenceArray<@Nullable ArrayReference<? extends L>> locks;

  private static <K> List<Object> doConcurrentGet(
      LoadingCache<K, ?> cache, K key, int nThreads, CountDownLatch gettersStartedSignal)
      throws InterruptedException {

    AtomicReferenceArray<Object> result = new AtomicReferenceArray<>(nThreads);
    CountDownLatch gettersComplete = new CountDownLatch(nThreads);
    for (int i = 0; i < nThreads; i++) {
      int index = i;
      Thread thread =
          new Thread(