public void setExtendData(Map<String, String> extendData) {
        this.extendData = extendData;
    }
@Test
    void testSetExtendData() {
        Map<String, String> extendData = new HashMap<>();
        extendData.put("nacos", "nacos");
        serviceMetadata.setExtendData(extendData);
        
        Map<String, String> map = serviceMetadata.getExtendData();
        assertNotNull(map);
        assertEquals(1, map.size());
    }