long initialTime = circuitBreaker.getTimeSinceLastStateChange();
        assertTrue(initialTime >= 0, "Should have initial timestamp");

        // Trip circuit
        circuitBreaker.trip();
        Thread.sleep(100);

        long afterTripTime = circuitBreaker.getTimeSinceLastStateChange();
        assertTrue(afterTripTime >= 100, "Time should have advanced");

        return successCount.get();
    }

    /**
     * Get time since last state change
     *
     * @return milliseconds since last state change
     */
    public long getTimeSinceLastStateChange() {
        return System.currentTimeMillis() - lastStateChangeTime.get();
    }

    /**
     * Manually reset the circuit breaker to closed state
     */
    public void reset() {