serverless/test/unit/lib/utils/ensure-exists.test.js

'use strict'

const chai = require('chai')
const sinon = require('sinon')

const ensureExists = require('../../../../lib/utils/ensure-exists')
const { getTmpDirPath } = require('../../../utils/fs')

const path = require('path')
const fsp = require('fs').promises
const crypto = require('crypto')

const expect = chai.expect
chai.use(require('chai-as-promised'))
chai.use(require('sinon-chai'))

describe('test/unit/lib/utils/ensureExists.test.js', () => {
  const testCacheDir = getTmpDirPath()

  it('Should call generate if file missing', async () => {
    const testFileName = `test-${crypto.randomBytes(2).toString('hex')}`
    const generateStub = sinon.stub().resolves()
    await ensureExists(path.resolve(testCacheDir, testFileName), generateStub)
    expect(generateStub.calledOnce).to.be.true
  })

  it('Should not call generate if file exists', async () => {
    const testFileName = `test-${crypto.randomBytes(2).toString('hex')}`
    await fsp.writeFile(path.resolve(testCacheDir, testFileName), '')
    const generateStub = sinon.stub().resolves()
    await ensureExists(path.resolve(testCacheDir, testFileName), generateStub)
    expect(generateStub.calledOnce).to.be.false
  })
})