checkSha1("b617318655057264e28bc0b6fb378c8ef146be00", key, data);
  }

  public void testRfc2202_hmacSha1_case2() {
    byte[] key = "Jefe".getBytes(UTF_8);
    String data = "what do ya want for nothing?";

    checkSha1("effcdf6ae5eb2fa2d27416d5f184df9c259a7c79", key, data);
  }

  public void testRfc2202_hmacSha1_case3() {
    byte[] key = fillByteArray(20, 0xaa);
    byte[] data = fillByteArray(50, 0xdd);

      this.future = future;
    }

    @Override
    public void run() {
      try {
        future.get();
      } catch (Exception e) {
        // nothing
      }
    }

    void awaitWaiting() {
      while (!isBlocked()) {
        if (getState() == State.TERMINATED) {
          throw new RuntimeException("Thread exited");
        }

 * instead.
 *
 * <pre>{@code
 * // Do NOT do this
 * Splitter splitter = Splitter.on('/');
 * splitter.trimResults(); // does nothing!
 * return splitter.split("wrong / wrong / wrong");
 * }</pre>
 *
 * <p>For separator-based splitters that do not use {@code omitEmptyStrings}, an input string

import java.util.Set;
import javax.annotation.CheckForNull;

/**
 * An immutable object that may contain a non-null reference to another object. Each instance of
 * this type either contains a non-null reference, or contains nothing (in which case we say that
 * the reference is "absent"); it is never said to "contain {@code null}".
 *
 * <p>A non-null {@code Optional<T>} reference can be used as a replacement for a nullable {@code T}

   *
   * @param hostPortString the input string to parse.
   * @return if parsing was successful, a populated HostAndPort object.
   * @throws IllegalArgumentException if nothing meaningful could be parsed.
   */
  @CanIgnoreReturnValue // TODO(b/219820829): consider removing
  public static HostAndPort fromString(String hostPortString) {
    checkNotNull(hostPortString);
    String host;

    String test = "Test string for NullOutputStream";
    byte[] bytes = test.getBytes(Charsets.US_ASCII);
    nos.write(bytes);
    nos.write(bytes, 2, 10);
    nos.write(bytes, bytes.length - 5, 5);
    // nothing really to assert?
    assertSame(ByteStreams.nullOutputStream(), ByteStreams.nullOutputStream());
  }

  public void testNullOutputStream_exceptions() throws Exception {

      Thread.yield();
      long d = ns - (System.nanoTime() - startTime);
      if (d > 0L) millis = d / (1000 * 1000);
      else break;
    }
  }

  /** Waits out termination of a thread pool or fails doing so. */
  void joinPool(ExecutorService exec) {
    try {
      exec.shutdown();
      assertTrue(
          "ExecutorService did not terminate in a timely manner",

      Double expectedDouble = null;
      try {
        expectedDouble = BigIntegerMath.roundToDouble(BigInteger.valueOf(candidate), UNNECESSARY);
      } catch (ArithmeticException expected) {
        // do nothing
      }

      if (expectedDouble != null) {
        assertThat(LongMath.roundToDouble(candidate, UNNECESSARY)).isEqualTo(expectedDouble);
      } else {
        try {

 * on the receiving instance; you must store and use the new encoding instance it returns, instead.
 *
 * <pre>{@code
 * // Do NOT do this
 * BaseEncoding hex = BaseEncoding.base16();
 * hex.lowerCase(); // does nothing!
 * return hex.decode("deadbeef"); // throws an IllegalArgumentException
 * }</pre>
 *
 * <p>It is guaranteed that {@code encoding.decode(encoding.encode(x))} is always equal to {@code

   */
  public static ByteArrayDataOutput newDataOutput(int size) {
    // When called at high frequency, boxing size generates too much garbage,
    // so avoid doing that if we can.
    if (size < 0) {
      throw new IllegalArgumentException(String.format("Invalid size: %s", size));
    }
    return newDataOutput(new ByteArrayOutputStream(size));
  }

  /**