public String selfHealth() {
        return memberManager.getSelf().getState().name();
    }
@Test
    void testSelfHealth() {
        Member member = new Member();
        member.setIp("1.1.1.1");
        member.setPort(8848);
        member.setState(NodeState.UP);
        
        when(serverMemberManager.getSelf()).thenReturn(member);
        
        String health = nacosClusterOperationService.selfHealth();
        assertEquals(NodeState.UP.name(), health);
    }