test.js

const assert = require('assert')
const fs = require('fs')
const nock = require('nock')
const { getShiftCode, getRegex, fetch: handler } = require('./handler.js')

const tweets = [
  'Use these SHiFT codes to unock Golden Keys in Borderlands: The Pre-Sequel! [Active through 04/22]\nBL:TP\nPC / Mac / Linux: 5WKBT-RKRW6-35BTB-3T3TJ-XTCHF\nXBOne/XB360: 5WKBT-RKRZ3-66FTF-5X3TJ-XTCXB\nPS4/PS3: 5KWT3-J6FKH-SZTCT-HBK3J-HZ55R',
  'It looks like the website is having some issues with Xbox SHiFT codes. Everything should work as intended by redeeming in-game!',
  'These SHiFT codes for 5 Golden Keys will grant you some new loot in Borderlands 2! [Active through 04/29]\nBL2\nPC/Mac: C3K3J-CH59J-XFT6K-T33J3-9WTJ9\nXB360/XBOne: K3C3T-CHRF5-S9FXZ-5FB3T-3X6KX\nPS3/PS4/PS Vita/PSVR: 5TCTT-FZJZ9-ZTCZ5-ZBKTB-WJ5CX',
  'Use these SHiFT codes to unlock 5 Gold Keys in Borderlands: Game of the Year! [Active through August 17]\nBL:GOTY\nAll Platforms: 5BWT3-6FWJK-K3FJH-3BJ33-KTTWF',
  'SHiFT codes! Get your SHiFT codes here! Oh gee, three free Golden Keys for Borderlands 3, see:\nWHCJB-XF9C9-KFWXS-XJT3T-3RTKR\n\nExpires July 6th 10am CT.\n\nGood luck and Happy Vault Hunting!'
]

const pc = getRegex('pc')
assert.strictEqual(getShiftCode(tweets[0], pc), '5WKBT-RKRW6-35BTB-3T3TJ-XTCHF')
assert.strictEqual(getShiftCode(tweets[1], pc), null)
assert.strictEqual(getShiftCode(tweets[2], pc), 'C3K3J-CH59J-XFT6K-T33J3-9WTJ9')
assert.strictEqual(getShiftCode(tweets[3], pc), '5BWT3-6FWJK-K3FJH-3BJ33-KTTWF')
assert.strictEqual(getShiftCode(tweets[4], pc), 'WHCJB-XF9C9-KFWXS-XJT3T-3RTKR')

const xbox = getRegex('xbox')
assert.strictEqual(getShiftCode(tweets[0], xbox), '5WKBT-RKRZ3-66FTF-5X3TJ-XTCXB')
assert.strictEqual(getShiftCode(tweets[1], xbox), null)
assert.strictEqual(getShiftCode(tweets[2], xbox), 'K3C3T-CHRF5-S9FXZ-5FB3T-3X6KX')
assert.strictEqual(getShiftCode(tweets[3], xbox), '5BWT3-6FWJK-K3FJH-3BJ33-KTTWF')
assert.strictEqual(getShiftCode(tweets[4], xbox), 'WHCJB-XF9C9-KFWXS-XJT3T-3RTKR')

const ps = getRegex('ps')
assert.strictEqual(getShiftCode(tweets[0], ps), '5KWT3-J6FKH-SZTCT-HBK3J-HZ55R')
assert.strictEqual(getShiftCode(tweets[1], ps), null)
assert.strictEqual(getShiftCode(tweets[2], ps), '5TCTT-FZJZ9-ZTCZ5-ZBKTB-WJ5CX')
assert.strictEqual(getShiftCode(tweets[3], ps), '5BWT3-6FWJK-K3FJH-3BJ33-KTTWF')
assert.strictEqual(getShiftCode(tweets[4], ps), 'WHCJB-XF9C9-KFWXS-XJT3T-3RTKR')

const promises = JSON.parse(fs.readFileSync('test/fixtures.json'))
  .map((tweet) => {
    nock('https://api.twitter.com').get('/1.1/statuses/user_timeline.json').query(true).reply(200, [tweet])
    return handler({ path: '/production' })
  })

Promise.all(promises)
  .then((responses) => responses.filter((response) => response.statusCode === 200))
  .then((responses) => assert.strictEqual(15, responses.length))

console.info('OK')