try {
        LongMath.ceilingPowerOfTwo(x);
        fail("Expected IllegalArgumentException");
      } catch (IllegalArgumentException expected) {
      }
    }
  }

  public void testFloorPowerOfTwoNegative() {
    for (long x : NEGATIVE_LONG_CANDIDATES) {
      try {
        LongMath.floorPowerOfTwo(x);
        fail("Expected IllegalArgumentException");
      } catch (IllegalArgumentException expected) {

      assertInvariants(map);
      try {
        iterator.remove();
        fail("Expected IllegalStateException.");
      } catch (IllegalStateException expected) {
      }
    } else {
      iterator.next();
      try {
        iterator.remove();
        fail("Expected UnsupportedOperationException.");
      } catch (UnsupportedOperationException expected) {
      }
    }

    checkResult(J, ITERABLE_123, "1-2-3");

    try {
      J.join(ITERABLE_NULL);
      fail();
    } catch (NullPointerException expected) {
    }
    try {
      J.join(ITERABLE_1_NULL_2);
      fail();
    } catch (NullPointerException expected) {
    }

    try {
      J.join(ITERABLE_NULL.iterator());
      fail();
    } catch (NullPointerException expected) {
    }
    try {

    try {
      builder.initialCapacity(-1);
      fail();
    } catch (IllegalArgumentException expected) {
    }
  }

  public void testInitialCapacity_setTwice() {
    CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder().initialCapacity(16);
    try {
      // even to the same value is not allowed
      builder.initialCapacity(16);
      fail();
    } catch (IllegalStateException expected) {
    }
  }

      // One more than maximum value
      UnsignedInts.decode("0xfffffffff");
      fail();
    } catch (NumberFormatException expected) {
    }

    try {
      UnsignedInts.decode("-5");
      fail();
    } catch (NumberFormatException expected) {
    }

    try {
      UnsignedInts.decode("-0x5");
      fail();
    } catch (NumberFormatException expected) {
    }

    try {

  }

  public void testNullListener() {
    try {
      future.addListener(null, directExecutor());
      fail();
    } catch (NullPointerException expected) {
    }
  }

  public void testNullExecutor() {
    try {
      future.addListener(doNothing(), null);
      fail();
    } catch (NullPointerException expected) {
    }
  }

  public void testNullTimeUnit() throws Exception {

    try {
      table.at(1, 3);
      fail();
    } catch (IndexOutOfBoundsException expected) {
    }
    try {
      table.at(1, -1);
      fail();
    } catch (IndexOutOfBoundsException expected) {
    }
    try {
      table.at(3, 2);
      fail();
    } catch (IndexOutOfBoundsException expected) {
    }
    try {
      table.at(-1, 2);
      fail();

    try {
      table.at(1, 3);
      fail();
    } catch (IndexOutOfBoundsException expected) {
    }
    try {
      table.at(1, -1);
      fail();
    } catch (IndexOutOfBoundsException expected) {
    }
    try {
      table.at(3, 2);
      fail();
    } catch (IndexOutOfBoundsException expected) {
    }
    try {
      table.at(-1, 2);
      fail();

    if (head == null) { // empty list
      head = tail = node;
      keyToKeyList.put(key, new KeyList<K, V>(node));
      modCount++;
    } else if (nextSibling == null) { // non-empty list, add to tail
      // requireNonNull is safe because the list is non-empty.
      requireNonNull(tail).next = node;
      node.previous = tail;
      tail = node;
      KeyList<K, V> keyList = keyToKeyList.get(key);

   * message passed to a later invocation of {@code fail()}, like "setCount should throw
   * UnsupportedOperationException."
   */
  abstract void setCountNoCheckReturnValue(E element, int count);

  private void assertSetCountIncreasingFailure(E element, int count) {
    try {
      setCountNoCheckReturnValue(element, count);
      fail("a call to multiset.setCount() to increase an element's count should throw");