assertTrue(mockService.unregisterWitness(reg1));
        assertTrue(mockService.unregisterWitness(reg3));
        assertEquals(0, mockService.getRegistrationCount());
    }

    @Test
    void testServiceAddressFormatting() {
        String serviceAddr = mockService.getServiceAddress();
        assertNotNull(serviceAddr);
        assertTrue(serviceAddr.startsWith("ncacn_ip_tcp:"));
        assertTrue(serviceAddr.contains("["));