"type":       "stop",

   */
  HTTP_3("h3"),
  ;

  /**
   * Returns the string used to identify this protocol for ALPN, like "http/1.1", "spdy/3.1" or
   * "h2".
   *
   * See also [IANA tls-extensiontype-values][iana].
   *
   * [iana]: https://www.iana.org/assignments/tls-extensiontype-values
   */
  override fun toString(): String = protocol

  companion object {
    /**
     * Returns the protocol identified by `protocol`.

import java.util.concurrent.Executor;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;
import org.jspecify.annotations.Nullable;

/**
 * Test for {@link FutureCallback}.
 *
 * @author Anthony Zana
 */
@GwtCompatible
@NullUnmarked
public class FutureCallbackTest extends TestCase {
  public void testSameThreadSuccess() {
    SettableFuture<String> f = SettableFuture.create();

import java.util.concurrent.locks.ReentrantLock;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Tests for {@link Uninterruptibles}.
 *
 * @author Anthony Zana
 */
@NullUnmarked
public class UninterruptiblesTest extends TestCase {
  private static final String EXPECTED_TAKE = "expectedTake";

  /** Timeout to use when we don't expect the timeout to expire. */

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