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)
})