this.version = version;
    }
    
    public int getValue() { return version; }
}
```

### 3.2 Witness Event Types
```java
public enum WitnessEventType {
    RESOURCE_CHANGE(1),        // Resource state changed
    CLIENT_MOVE(2),           // Client should move to different node
    SHARE_MOVE(3),            // Share moved to different node
    IP_CHANGE(4),             // IP address changed

    }

    @Test
    void testMockServiceNotifications() {
        // Test notification sending (just logs for mock)
        mockService.sendNotification(WitnessEventType.RESOURCE_CHANGE, "TestResource");

        // Register a witness first
        String regId = mockService.registerWitness("TestResource", "192.168.1.100", 1);

        // Send notification affecting the registration

        switch (messageType) {
        case WitnessAsyncNotifyMessage.WitnessNotificationMessage.WITNESS_RESOURCE_CHANGE:
            return WitnessEventType.RESOURCE_CHANGE;
        case WitnessAsyncNotifyMessage.WitnessNotificationMessage.WITNESS_CLIENT_MOVE:
            return WitnessEventType.CLIENT_MOVE;
        case WitnessAsyncNotifyMessage.WitnessNotificationMessage.WITNESS_SHARE_MOVE: