private void registerFunction() {
    logger.info("register Fn");
    Function txFunction = new MyTransactionFunction();
    FunctionService.registerFunction(txFunction);
  }
Test two non colocated functions in a transaction. This method invokes
{@link MyTransactionFunction} and tells it what to test, using different arguments.

@param redundantBuckets redundant buckets for colocated PRs
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/execute/PRTransactionDUnitTest.java