@Override
    public String getMetaServerAddress(Env targetEnv) {
        String metaServerAddress = domains.get(targetEnv);
        return metaServerAddress == null ? null : metaServerAddress.trim();
    }
@Test
  public void testFromPropertyFile() {
    assertEquals("http://localhost:8080", defaultPortalMetaServerProvider.getMetaServerAddress(Env.LOCAL));
    assertEquals("${dev_meta}", defaultPortalMetaServerProvider.getMetaServerAddress(Env.DEV));
    assertEquals("${pro_meta}", defaultPortalMetaServerProvider.getMetaServerAddress(Env.PRO));
  }