new_contents: from xenon import Xenon
  import time
  
  
  with Xenon() as xenon:
      time.sleep(1)
  
      scheduler = xenon.jobs.newScheduler(
          xenon.NewSchedulerRequest(adaptor='local'))
  
      job_description = xenon.JobDescription(
          executable='echo',
          arguments=['"Hello, World!"'],
          stdOut='hello.txt')
  
      job = xenon.jobs.submitJob(xenon.SubmitJobRequest(
          scheduler=scheduler, description=job_description))
      job_status = xenon.jobs.waitUntilDone(job)
      if job_status.exitCode != 0:
          raise Exception(job_status.errorMessage)
      xenon.jobs.deleteJob(job)
      xenon.jobs.closeScheduler(scheduler)
  
  
subject: add unittest also as example