assertEquals(0, circuitBreaker.getFailureCount(), "Failure count should remain 0");
    }

    @Test
    public void testFailureThresholdOpensCircuit() {
        // Fail 3 times to open circuit
        for (int i = 0; i < 3; i++) {
            final int index = i;
            try {
                circuitBreaker.executeWithCircuitBreaker(() -> {