assertEquals(SimpleCircuitBreaker.State.HALF_OPEN, circuitBreaker.getState());
    }

    @Test
    @DisplayName("Test circuit closes after success threshold in HALF_OPEN")
    void testCircuitClosesAfterSuccessThreshold() throws Exception {
        // Open the circuit
        circuitBreaker.tripBreaker();

        // Wait for timeout
        Thread.sleep(150);