mockFinagleService.scala

def consulResponse(s: Secrets): ConsulResponse =
  ConsulResponse(...., Base64Encode(s.toJson), ...)
  
def mockConsulService(secrets: Secrets): Service[Request, Response] = {
  new Service[Request, Response] {
  
    def apply(req: Request): Future[Response] = {
      val res = Response(Status.Ok)
      (req.method, req.path) match {
        case (Get, Root / "/v1/k1") => res.contentString = consulResponse(secrets).toJson
        case (Put, path) => 
      }
      Future.value(res)
    }
  }
}