}
  }

  /**
   * Delays, via Thread.sleep, for the given millisecond delay, but if the sleep is shorter than
   * specified, may re-sleep or yield until time elapses.
   */
  static void delay(long millis) throws InterruptedException {
    long startTime = System.nanoTime();
    long ns = millis * 1000 * 1000;
    for (; ; ) {
      if (millis > 0L) Thread.sleep(millis);
      else // too short to sleep

    }
  }

  /**
   * Delays, via Thread.sleep, for the given millisecond delay, but if the sleep is shorter than
   * specified, may re-sleep or yield until time elapses.
   */
  static void delay(long millis) throws InterruptedException {
    long startTime = System.nanoTime();
    long ns = millis * 1000 * 1000;
    for (; ; ) {
      if (millis > 0L) Thread.sleep(millis);
      else // too short to sleep

    filtered.put("chicken", 7);
    assertEquals(ImmutableMap.of("cat", 3, "horse", 5, "chicken", 7), filtered);

    try {
      filtered.putAll(ImmutableMap.of("sheep", 5, "cow", 7));
      fail();
    } catch (IllegalArgumentException expected) {
    }
    assertEquals(ImmutableMap.of("cat", 3, "horse", 5, "chicken", 7), filtered);
  }

    filtered.put("chicken", 7);
    assertEquals(ImmutableMap.of("cat", 3, "horse", 5, "chicken", 7), filtered);

    try {
      filtered.putAll(ImmutableMap.of("sheep", 5, "cow", 7));
      fail();
    } catch (IllegalArgumentException expected) {
    }
    assertEquals(ImmutableMap.of("cat", 3, "horse", 5, "chicken", 7), filtered);
  }