private void awaitServerMetaDataToContainClient() {
    await()
        .untilAsserted(() -> assertThat(
            getCacheServer().getAcceptor().getCacheClientNotifier().getClientProxies().size())
                .isEqualTo(1));

    CacheClientProxy proxy = getClientProxy();
    assertThat(proxy).isNotNull();

    await().until(() -> getClientProxy().isAlive() && getClientProxy()
        .getRegionsWithEmptyDataPolicy().containsKey(SEPARATOR + PROXY_REGION_NAME));
  }
Register list of keys on given region
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/RegisterInterestServerMetaDataDistributedTest.java