{
  "description": "Copy of the prebid test ad, with the addition of an unknown bidder",
  "mockBidRequest": {
    "id": "some-request-id",
    "site": {
      "page": "prebid.org"
    },
    "imp": [
      {
        "id": "some-impression-id",
        "banner": {
          "format": [
            {
              "w": 300,
              "h": 250
            },
            {
              "w": 300,
              "h": 600
            }
          ]
        },
        "ext": {
          "prebid": {
            "bidder": {}
          },
          "appnexus": {
            "placementId": 12883451
          },
          "unknownbidder": {
            "param1": "foobar",
            "param2": 42
          }
        }
      }
    ],
    "tmax": 500
  },
  "expectedReturnCode": 400,
  "expectedErrorMessage": "Invalid request: request.imp[0].ext.prebid.bidder must contain at least one bidder\n"
}