mocha-runner.js

process.env.BABEL_ENV = 'test'
process.env.NODE_ENV = 'test'

// Makes the script crash on unhandled rejections instead of silently
// ignoring them. In the future, promise rejections that are not handled will
// terminate the Node.js process with a non-zero exit code.
process.on('unhandledRejection', error => {
  throw error
})

require('core-js/stable')
require('regenerator-runtime/runtime')

let options = require('yargs').argv
let getConfig = require('./config')
let config = getConfig(options)

require('@babel/register')({
  ...config.babel(true, config),
  extensions: ['.es6', '.es', '.jsx', '.js', '.mjs', '.ts', '.tsx']
})

let Mocha = require('mocha')
let fs = require('fs')
let path = require('path')

// Instantiate a Mocha instance.
let mocha = new Mocha({
  timeout: 20000,
  ...options
})

function travelDirectoryToAddTestFiles(dir) {
  fs.readdirSync(dir).forEach(file => {
    let filename = path.join(dir, file)
    // ignore node_modules
    if (
      filename.indexOf('node_modules') !== -1 ||
      filename.indexOf('publish') !== -1
    ) {
      return
    }
    // read file deeply
    if (fs.statSync(filename).isDirectory()) {
      return travelDirectoryToAddTestFiles(filename)
    }
    // add *test.js file to the mocha instance
    if (filename.substr(-8) === '-test.js') {
      return mocha.addFile(filename)
    }
  })
}

travelDirectoryToAddTestFiles(__dirname)

// Run the tests.
mocha.run(function(failures) {
  // exit with non-zero status if there were failures
  // Mocha Won't Force Exit
  process.exit(failures)
})