Start an auto test

{
  "id": "652f2b1e8f1b2c3d4e5f6a7b",
  "experiment": {
    "type": "turbo",
    "status": "running"
  }
}

{
  "type": "https://docs.vturb.com/errors/unprocessable_content",
  "code": "unprocessable_content",
  "message": "The request is invalid. See errors for the fields that failed.",
  "request_id": "00000000-0000-0000-0000-000000000000",
  "errors": [
    {
      "field": "speed_end",
      "message": "must be between 0.9 and 1.5"
    }
  ]
}