}
    }

    @Test
    public void testBackpressureControl() throws Exception {
        // Create circuit breaker with backpressure enabled
        SmbCircuitBreaker backpressureCircuitBreaker = new SmbCircuitBreaker("backpressure-test", 5, 2, 1000, 3, false, true, 2);

        try {
            CountDownLatch startLatch = new CountDownLatch(1);

        // Backpressure control
        if (backpressureEnabled && requestSemaphore != null) {
            if (!requestSemaphore.tryAcquire()) {
                totalBackpressureRejections.incrementAndGet();
                throw new CIFSException("Circuit breaker '" + name + "' rejected request due to backpressure");
            }
        }