* Set the `Cache-Control: no-cache` header to **prevent caching** of the stream.
* Set a special header `X-Accel-Buffering: no` to **prevent buffering** in some proxies like Nginx.

 * @author Chris Nokleberg
 * @since 14.0
 */
@GwtIncompatible
public final class TestingExecutors {
  private TestingExecutors() {}

  /**
   * Returns a {@link ScheduledExecutorService} that never executes anything.
   *
   * <p>The {@code shutdownNow} method of the returned executor always returns an empty list despite
   * the fact that everything is still technically awaiting execution. The {@code getDelay} method

            Subject copySubj = copy.getSubject();
            assertNull(copySubj, "Clone should also return null when original has null cached subject");

            // Refresh should not break anything
            orig.refresh();
            copy.refresh();

            // Both should still return null
            assertNull(orig.getSubject(), "Original should still return null after refresh");

          required: true
        - label: >
            I have visited the [idea graveyard](https://github.com/google/guava/wiki/IdeaGraveyard),
            and did not see anything similar to this idea.

out a history of the accident, all except the Lizard, who seemed
too much overcome to do anything but sit with its mouth open,
gazing up into the roof of the court.

  `What do you know about this business?' the King said to
Alice.

  `Nothing,' said Alice.

  `Nothing WHATEVER?' persisted the King.

  `Nothing whatever,' said Alice.

  `That's very important,' the King said, turning to the jury.

      }

      @Override
      void visitWildcardType(WildcardType fromWildcardType) {
        if (!(to instanceof WildcardType)) {
          return; // okay to say <?> is anything
        }
        WildcardType toWildcardType = (WildcardType) to;
        Type[] fromUpperBounds = fromWildcardType.getUpperBounds();
        Type[] toUpperBounds = toWildcardType.getUpperBounds();

    tearDownStack.addTearDown(() -> Thread.interrupted());
  }

  @Override
  protected void tearDown() {
    tearDownStack.runTearDown();
  }

  /**
   * This first test doesn't test anything in Uninterruptibles, just demonstrates some normal
   * behavior of futures so that you can contrast the next test with it.
   */
  public void testRegularFutureInterrupted() throws ExecutionException {
    /*

import org.bouncycastle.jce.provider.BouncyCastleProvider
import org.bouncycastle.jsse.provider.BouncyCastleJsseProvider
import org.conscrypt.Conscrypt
import org.hamcrest.BaseMatcher
import org.hamcrest.CoreMatchers.anything
import org.hamcrest.Description
import org.hamcrest.Matcher
import org.hamcrest.StringDescription
import org.hamcrest.TypeSafeMatcher
import org.junit.jupiter.api.Assertions.fail

  /*
   * The following tests check that the use of FinalizableReferenceQueue does not prevent the
   * ClassLoader that loaded that class from later being garbage-collected. If anything continues
   * to reference the FinalizableReferenceQueue class then its ClassLoader cannot be
   * garbage-collected, even if there are no more instances of FinalizableReferenceQueue itself.

    tearDownStack.addTearDown(() -> Thread.interrupted());
  }

  @Override
  protected void tearDown() {
    tearDownStack.runTearDown();
  }

  /**
   * This first test doesn't test anything in Uninterruptibles, just demonstrates some normal
   * behavior of futures so that you can contrast the next test with it.
   */
  public void testRegularFutureInterrupted() throws ExecutionException {
    /*