Experimenter:
  ExperimenterMissing:
    message:
      header:
        version: 4
        type: OFPT_EXPERIMENTER
        length: 12
        xid: 0
    expectation: false
    description: Experimenter without required fields
  Experimenter:
    message:
      header:
        version: 4
        type: OFPT_EXPERIMENTER
        length: 12
        xid: 0
      experimenter: 0
      exp_type: 0
    expectation: true
    description: Experimenter message