assertBitEquals(x - y, a.get());
      }
    }
  }

  /** updateAndGet with sum stores sum of given value to current, and returns current value */
  public void testUpdateAndGetWithSum() {
    for (double x : VALUES) {
      for (double y : VALUES) {
        AtomicDouble a = new AtomicDouble(x);
        double z = a.updateAndGet(value -> value + y);
        assertBitEquals(x + y, z);

        }
      }
    }
  }

  /** updateAndGet adds given value to current, and returns current value */
  public void testUpdateAndGetWithSum() {
    AtomicDoubleArray aa = new AtomicDoubleArray(SIZE);
    for (int i : new int[] {0, SIZE - 1}) {
      for (double x : VALUES) {
        for (double y : VALUES) {
          aa.set(i, x);
          double z = aa.updateAndGet(i, value -> value + y);

            recentAttempts.incrementAndGet();
            lastAttempt = now;
        }

        void recordSuccess() {
            // Reduce counter on success to allow recovery
            recentAttempts.updateAndGet(val -> Math.max(0, val - 1));
        }

        void reset() {
            recentAttempts.set(0);
            blocked.set(false);
            blockExpiry = null;
            windowStart = Instant.now();