private void createClientRegion(VM vm, final int port1, final boolean isEmpty, int port2) {
    createClientRegion(vm, port1, isEmpty, false, port2);
  }
tests for the concurrentMapOperations. there are more tests in ClientServerMiscDUnitTest
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ConcurrentMapOpsDUnitTest.java