{
  "description": "Bid request's imp comes with elements in unsupported metric array",
  "mockBidRequest": {
      "id":"req-id",
      "imp":[
        {
          "id":"imp-id",
          "metric": [{}]
        }
      ],
      "app": {
        "id": "app_001"
      }
  },
  "expectedReturnCode": 400,
  "expectedErrorMessage": "Invalid request: request.imp[0].metric is not yet supported by prebid-server. Support may be added in the future\n"
}