}

  public void testGetAndAdd() {
    Count holder = new Count(20);
    assertEquals(20, holder.get());
    holder.add(1);
    assertEquals(21, holder.get());
  }

  public void testAddAndGet() {
    Count holder = new Count(20);
    assertEquals(21, holder.addAndGet(1));
  }

  public void testGetAndSet() {
    Count holder = new Count(10);
    assertEquals(10, holder.getAndSet(20));

  }

  public void testGetAndAdd() {
    Count holder = new Count(20);
    assertEquals(20, holder.get());
    holder.add(1);
    assertEquals(21, holder.get());
  }

  public void testAddAndGet() {
    Count holder = new Count(20);
    assertEquals(21, holder.addAndGet(1));
  }

  public void testGetAndSet() {
    Count holder = new Count(10);
    assertEquals(10, holder.getAndSet(20));

        assertBitEquals(x, z);
        assertBitEquals(x + y, a.get());
      }
    }
  }

  /** addAndGet adds given value to current, and returns current value */
  public void testAddAndGet() {
    for (double x : VALUES) {
      for (double y : VALUES) {
        AtomicDouble a = new AtomicDouble(x);
        double z = a.addAndGet(y);
        assertBitEquals(x + y, z);