private VM getPrimaryServerVM() {
    assertThat(primaryServerPort).isGreaterThan(-1);
    if (primaryServerPort == serverPort1) {
      return server;
    } else {
      return server2;
    }
  }
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