public static String getUserTenantForAns() {
        String tmp = USER_TENANT;
        
        if (StringUtils.isBlank(USER_TENANT)) {
            tmp = NacosClientProperties.PROTOTYPE.getProperty(SystemPropertyKeyConst.ANS_NAMESPACE);
        }
        return tmp;
    }
@Test
    void testGetUserTenantForAns() {
        String expect = "test";
        System.setProperty("ans.namespace", expect);
        String actual = TenantUtil.getUserTenantForAns();
        assertEquals(expect, actual);
    }