@Override
      public Object call() throws Exception {
        Region<Integer, String> r = getGemfireCache().getRegion(REP_REG_NAME);
        Region<Integer, String> pr = getGemfireCache().getRegion(PR_REG_NAME);
        waitForCreates(r);
        waitForCreates(pr);
        return null;
      }
tests for the concurrentMapOperations. there are more tests in ClientServerMiscDUnitTest
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ConcurrentMapOpsDUnitTest.java