assertNotNull(WitnessRegistration.WitnessRegistrationState.FAILED);
        assertNotNull(WitnessRegistration.WitnessRegistrationState.EXPIRED);
    }

    @Test
    void testEnumToStringConversions() {
        // Test that enum toString methods work properly
        assertEquals("CLUSTER_WITNESS", WitnessServiceType.CLUSTER_WITNESS.toString());