public int getErrCode() {
        return errCode;
    }
@Test
    void testConstructorWithErrorCodeAndMsg() {
        NacosRuntimeException exception = new NacosRuntimeException(NacosException.INVALID_PARAM, "test");
        assertEquals(NacosException.INVALID_PARAM, exception.getErrCode());
        assertEquals("errCode: 400, errMsg: test ", exception.getMessage());
        assertNull(exception.getCause());
    }