{
  "description": "Request with wrong source value",
  "mockBidRequest": {
    "id": "some-request-id",
    "app": {
      "ext": {
        "prebid": {
          "source": { 
            "foo": "prebid-mobile"
          },
          "version": "1.0"
        }
      }
    },
    "imp": [
      {
        "id": "my-imp-id",
        "banner": {
          "format": [
            {
              "w": 300,
              "h": 600
            }
          ]
        },
        "pmp": {
          "deals": [
            {
              "id": "some-deal-id"
            }
          ]
        },
        "ext": {
          "appnexus": {
            "placementId": 12883451
          }
        }
      }
    ]
  },
  "expectedReturnCode": 400,
  "expectedErrorMessage": "Invalid request: cannot unmarshal openrtb_ext.ExtAppPrebid.Source: expects \" or n, but found {"
}