@Override
        public void execute(FunctionContext context) {
          if (context.getArguments() instanceof String) {
            context.getResultSender().lastResult("Success");
          } else {
            context.getResultSender().lastResult("Failure");
          }
        }
This tests make sure that, in case of LonerDistributedSystem we dont get ClassCast Exception.
Just making sure that the function executed on lonerDistribuedSystem
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/execute/MemberFunctionExecutionDUnitTest.java