private void validateServerMetaDataKnowsThatClientRegisteredInterest() {
    CacheClientProxy proxy = getClientProxy();
    assertThat(proxy.hasRegisteredInterested()).isTrue();
  }
Create client cache and return the client connection pool's primary server port
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/ClientWithInterestFailoverDistributedTest.java