{
  "description": "Native request listing elements with duplicate ids in the assets array the imp.native.request field",
  "mockBidRequest": {
    "id": "req-id",
    "site": {
      "page": "some.page.com"
    },
    "tmax": 500,
    "imp": [
      {
        "id": "some-imp",
        "native": {
          "request": "{\"context\":1,\"plcmttype\":1,\"assets\":[{\"id\":1,\"img\":{\"wmin\":30}},{\"id\":1,\"title\":{\"len\":20}}]}"
        },
        "ext": {
          "appnexus": {
            "placementId": 12883451
          }
        }
      }
    ]
  },
  "expectedReturnCode": 400,
  "expectedErrorMessage": "Invalid request"
}