Vendor:
  VendorMissing:
    message:
      header:
        version: 1
        type: OFPT_VENDOR
        length: 12
        xid: 0
    expectation: false
    description: Vendor message without vendor ID
  Vendor:
    message:
      header:
        version: 1
        type: OFPT_VENDOR
        length: 12
        xid: 0
      vendor: 12345
    expectation: true
    description: Vendor message