How-to mock a Sentinel http import

Introduction

For the purposes of testing a Sentinel policy, some functions need to return expected values. Mocking the http get or post facilitates this  and allows for testing in a controlled manner.

Prerequisites (if applicable)

•  Please refer to Mocking on how to run Sentinel to mock data 

Use Case

The following executable code can be found here in the Sentinel Playground

policy.sentinel

import "http"

req = http.request("https://wat.com").
with_header("thing", "foo").
with_body("why")

print(req)
print("******")
resp = http.post(req)
print(resp.body)

main = true

mock-http.sentinel

func request(url) {
  return builder({
    "url": url,
    "headers": {},
    "body": "",
  })
}

func with_header(req) {
  return func(name, value) {
    req.headers[name] = value
    return builder(req)
  }
}

func with_body(req) {
  return func(body) {
    req["body"] = body
    return builder(req)
  }
}

func builder(req) {
  return {
    "url": req.url,
    "headers": req.headers,
    "body": req.body,
    "with_header": with_header(req),
    "with_body": with_body(req),
  }
}

func post(req) {
  return {
    "status_code": 200,
    "body": "mock post data",
  }
}