}
  }

  /** A special value to represent cancellation and the 'wasInterrupted' bit. */
  private static final class Cancellation {
    // constants to use when GENERATE_CANCELLATION_CAUSES = false
    @CheckForNull static final Cancellation CAUSELESS_INTERRUPTED;
    @CheckForNull static final Cancellation CAUSELESS_CANCELLED;

    static {
      if (GENERATE_CANCELLATION_CAUSES) {

    }
  }

  /** A special value to represent cancellation and the 'wasInterrupted' bit. */
  private static final class Cancellation {
    // constants to use when GENERATE_CANCELLATION_CAUSES = false
    @CheckForNull static final Cancellation CAUSELESS_INTERRUPTED;
    @CheckForNull static final Cancellation CAUSELESS_CANCELLED;

    static {
      if (GENERATE_CANCELLATION_CAUSES) {

import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import javax.annotation.concurrent.GuardedBy;
import junit.framework.TestCase;

/** Tests for {@link AbstractFuture} with the cancellation cause system property set */
@AndroidIncompatible // custom classloading

public class AbstractFutureCancellationCauseTest extends TestCase {

  private ClassLoader oldClassLoader;

import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import javax.annotation.concurrent.GuardedBy;
import junit.framework.TestCase;

/** Tests for {@link AbstractFuture} with the cancellation cause system property set */
@AndroidIncompatible // custom classloading

public class AbstractFutureCancellationCauseTest extends TestCase {

  private ClassLoader oldClassLoader;

 *
 * <p>This class has limited support for cancellation and other "early completions":
 *
 * <ul>
 *   <li>While calls to {@code submit} and {@code submitAsync} return a {@code Future} that can be
 *       cancelled, cancellation never propagates to a task that has started to run -- neither to
 *       the callable itself nor to any {@code Future} returned by an {@code AsyncCallable}.

     * All elements of `futures` are completed, or this future has already completed and read
     * `futures` into a local variable (in preparation for propagating cancellation to them). In
     * either case, no one needs to read `futures` for cancellation purposes later. (And
     * cancellation purposes are the main reason to access `futures`, as discussed in its docs.)
     */
    this.futures = null;
  }

  enum ReleaseResourcesReason {

  /**
   * Tests that a canceled future throws a cancellation exception.
   *
   * <p>This method checks the cancel, isCancelled, and isDone methods.
   */
  public void testCanceledFutureThrowsCancellation() throws Exception {

    assertFalse(future.isDone());
    assertFalse(future.isCancelled());

    CountDownLatch successLatch = new CountDownLatch(1);

    // Run cancellation in a separate thread as an extra thread-safety test.

 *
 * <p>This class has limited support for cancellation and other "early completions":
 *
 * <ul>
 *   <li>While calls to {@code submit} and {@code submitAsync} return a {@code Future} that can be
 *       cancelled, cancellation never propagates to a task that has started to run -- neither to
 *       the callable itself nor to any {@code Future} returned by an {@code AsyncCallable}.

 * Futures#transform(ListenableFuture, Function, Executor) Futures.transform}, but you will often
 * find it easier to use a framework. Frameworks automate the process, often adding features like
 * monitoring, debugging, and cancellation. Examples of frameworks include:
 *
 * <ul>
 *   <li><a href="https://dagger.dev/producers.html">Dagger Producers</a>
 * </ul>
 *

    // Load the "normal" copy of SettableFuture and related classes.
    SettableFuture<?> unused = SettableFuture.create();
    // Hack to load AbstractFuture et. al. in a new classloader so that it tries to re-read the
    // cancellation-cause system property. This allows us to test what happens if reading the
    // property is forbidden and then continue running tests normally in one jvm without resorting