public/js/tests/tell-me-who_test.mjs

import * as cp from 'child_process'
import { mkdir, writeFile } from 'fs/promises'
import { join, isAbsolute } from 'path'
import { tmpdir } from 'os'
import { promisify } from 'util'

const exec = promisify(cp.exec)
export const tests = []

export const setup = async ({ path }) => {
  const dir = `${tmpdir()}/tell-me-who`
  await mkdir(dir)

  const createFilesIn = async ({ fileNames, dirPath }) =>
    await Promise.all(
      fileNames.map(
        async (fileName) => await writeFile(`${dirPath}/${fileName}`, ''),
      ),
    )

  const run = async (cmd) => {
    const cmdPath = isAbsolute(cmd || '') ? cmd : join(dir, cmd || '')
    const { stdout } = await exec(`node ${path} ${cmdPath}`)

    return { stdout: stdout.trim() }
  }

  return { tmpPath: dir, run, createFilesIn }
}

tests.push(async ({ eq, ctx, randStr, upperFirst }) => {
  const random = upperFirst(randStr())
  const fileNames = [
    'Ubaid_Ballard.json',
    'Victoria_Chan.json',
    'Dominika_Mullen.json',
    'Heath_Denton.json',
    `${random}_Hamilton.json`,
  ]
  const dirName = `them-${randStr()}`
  const dirPath = join(ctx.tmpPath, dirName)
  await mkdir(dirPath)
  await ctx.createFilesIn({ dirPath, fileNames })

  const { stdout } = await ctx.run(dirName)
  return eq(
    [
      `1. Ballard Ubaid`,
      `2. Chan Victoria`,
      `3. Denton Heath`,
      `4. Hamilton ${random}`,
      `5. Mullen Dominika`,
    ],
    stdout.split('\n'),
  )
})

Object.freeze(tests)