{
  "mockBidRequest": {
    "id": "some-request-id",
    "tmax": 1000,
    "imp": [
      {
        "id": "correct-impression-id",
        "bidfloor": 4.2,
        "ext": {
          "bidder": {
            "supplierId": "777XYZ123"
          }
        },
        "audio": {
          "mimes": [
            "audio/mpeg"
          ]
        }
      }
    ],
    "test": 1,
    "site": {
      "publisher": {
        "id": "1"
      },
      "page": "http://www.example.com",
      "domain": "www.example.com"
    },
    "device": {}
  },
  "httpCalls": [
    {
      "expectedRequest": {
        "uri": "http://exchange.example.com/bid/777XYZ123",
        "headers": {
          "Content-Type": [
            "application/json;charset=utf-8"
          ],
          "Accept": [
            "application/json"
          ]
        },
        "body": {
          "id": "some-request-id",
          "tmax": 1000,
          "imp": [
            {
              "id": "correct-impression-id",
              "bidfloor": 4.2,
              "ext": {
                "bidder": {
                  "supplierId": "777XYZ123"
                }
              },
              "audio": {
                "mimes": [
                  "audio/mpeg"
                ]
              }
            }
          ],
          "site": {
            "publisher": {
              "id": "1"
            },
            "page": "http://www.example.com",
            "domain": "www.example.com"
          },
          "device": {},
          "test": 1
        },
        "impIDs":["correct-impression-id"]
      },
      "mockResponse": {
        "status": 200,
        "body": {
          "id": "some-request-id",
          "cur": "USD",
          "seatbid": [
            {
              "bid": [
                {
                  "id": "1",
                  "impid": "unexpected-impression-id",
                  "crid": "some-creative-id",
                  "adm": "<VAST>TAG</VAST>",
                  "price": 6.5
                }
              ]
            }
          ]
        }
      }
    }
  ],
  "expectedBidResponses": [{"currency":"USD","bids":[]}],
  "expectedMakeBidsErrors": [
    {
      "value": "Failed to find impression: \"unexpected-impression-id\"",
      "comparison": "literal"
    }
  ]
}