private void validateServerMetaDataKnowsThatClientRegisteredInterest() {
    CacheClientProxy proxy = getClientProxy();
    assertThat(proxy.hasRegisteredInterested()).isTrue();
  }
Register list of keys on given region
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/RegisterInterestServerMetaDataDistributedTest.java