*
     * However, the checker *we* use has this special knowledge about `Collection.toArray()` anyway,
     * so in our implementation code, we can rely on that. That's why the expression below
     * type-checks.
     */
    return super.toArray();
  }

  private static final long serialVersionUID = 0L;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.Semaphore;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import junit.framework.TestCase;

/**
 * Tests for Striped.
 *
 * @author Dimitris Andreou
 */

   * @return this for the builder pattern
   */
  @CanIgnoreReturnValue
  public ThreadFactoryBuilder setPriority(int priority) {
    // Thread#setPriority() already checks for validity. These error messages
    // are nicer though and will fail-fast.
    checkArgument(
        priority >= Thread.MIN_PRIORITY,
        "Thread priority (%s) must be >= %s",
        priority,

    do {
      delegate.add(checkNotNull(elements.next()));
    } while (elements.hasNext());

    return unsafeDelegate(delegate);
  }

  // Factory methods that skips the null checks on elements, only used when
  // the elements are known to be non-null.
  static <E> ImmutableSet<E> unsafeDelegate(Set<E> delegate) {
    switch (delegate.size()) {
      case 0:
        return of();
      case 1:

          assertEquals(expected, actual);
        }
      }
    }
  }

  @GwtIncompatible // java.math.BigInteger
  public void testIsPowerOfTwo() {
    for (int x : ALL_INTEGER_CANDIDATES) {
      // Checks for a single bit set.
      BigInteger bigX = BigInteger.valueOf(x);
      boolean expected = (bigX.signum() > 0) && (bigX.bitCount() == 1);
      assertEquals(expected, IntMath.isPowerOfTwo(x));
    }
  }

     * implement Function<A, B>, as discussed in a class-level comment), it would make some sense to
     * perform runtime null checks on the input and output. (That would also make NullPointerTester
     * happy!) However, since we didn't do that for many years, we're not about to start now.
     * (Runtime checks could be particularly bad for users of LegacyConverter.)
     *

     * its own "running" check.
     */
    void awaitRunChecks() throws InterruptedException {
      assertTrue(
          "Service thread hasn't finished its checks. "
              + "Exception status (possibly stale): "
              + thrownByExecutionThread,
          hasConfirmedIsRunning.await(10, SECONDS));
    }

    @Override
    protected void doStart() {

 * autoboxing and varargs array creation may happen as well, even when the verification succeeds and
 * the message ends up unneeded. Performance-sensitive verification checks should continue to use
 * usual form:
 *
 * <pre>{@code
 * Bill bill = remoteService.getLastUnpaidBill();
 * if (bill.status() != Status.UNPAID) {

    Object key = new Object();
    assertNotNull(cache.getUnchecked(key));

    CacheTesting.simulateValueReclamation(cache, key);

    // this blocks if computation can't deal with partially-collected values
    assertNotNull(cache.getUnchecked(key));
    assertEquals(1, cache.size());
    assertEquals(2, countingLoader.getCount());

          int unused = value.hashCode();
        } catch (Exception e) {
          return false;
        }
        return true;
      }
    }
    return true;
  }

  /**
   * Checks all the properties that should always hold of a map. Also calls {@link
   * #assertMoreInvariants} to check invariants that are peculiar to specific implementations.
   *
   * @see #assertMoreInvariants