private void executeUnregisteredFunction() {
    FunctionService.unregisterFunction(new DistributedRegionFunction().getId());

    TypedFunctionService
        .<Void, Boolean, List<Boolean>>onRegion(getRegion())
        .withFilter(filter)
        .execute(new DistributedRegionFunction())
        .getResult();
  }
Verify that AuthenticationRequiredException is not thrown when security-* properties are NOT
provided. We have to grep for this exception in logs for any occurrence.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/execute/DistributedRegionFunctionExecutionDUnitTest.java