@Override
  public boolean exists(Env targetEnv) {
    return addresses.containsKey(targetEnv);
  }
@Test
  public void testExists() {
    assertTrue(databasePortalMetaServerProvider.exists(Env.DEV));
    assertFalse(databasePortalMetaServerProvider.exists(Env.PRO));
    assertTrue(databasePortalMetaServerProvider.exists(Env.addEnvironment("nothing")));
  }