{
  "description": "Native request with an imp.native.request.context value that doesn't match that of the context_sub_type list",
  "mockBidRequest": {
    "id": "req-id",
    "site": {
      "page": "some.page.com"
    },
    "tmax": 500,
    "imp": [
      {
        "id": "some-imp",
        "native": {
          "request": "{\"context\":376,\"plcmttype\":2,\"assets\":[{\"img\":{\"hmin\":30,\"wmin\":20}}]}"
        },
        "ext": {
          "appnexus": {
            "placementId": 12883451
          }
        }
      }
    ]
  },
  "expectedReturnCode": 400,
  "expectedErrorMessage": "Invalid request"
}