code: def expect_no_raises(message=None, extras=None):
      
      try:
          yield
      except Exception as e:
          e_record = records.ExceptionRecord(e)
          if extras:
              e_record.extras = extras
          msg = message or 'Got an unexpected exception'
          details = '%s: %s' % (msg, e_record.details)
          logging.exception(details)
          e_record.details = details
          recorder.add_error(e_record)
docs: Expects no exception is raised in a context.
  
      If the expectation is not met, the test is marked as fail after its
      execution finishes.
  
      A default message is added to the exception `details`.
  
      Args:
          message: string, custom message to add to exception's `details`.
          extras: An optional field for extra information to be included in test
              result.