node_modules/axe-core/doc/examples/test-examples.js

const { readdirSync, statSync } = require('fs');
const { join } = require('path');
const execa = require('execa');
const exampleDirs = readdirSync(__dirname)
	.map(dir => join(__dirname, dir))
	.filter(dir => statSync(dir).isDirectory());

const config = { stdio: 'inherit', shell: true };

// run npm install in parallel
async function install(dir) {
	await execa('npm install', { cwd: dir, ...config });

	// override the package version of axe-core with the local version.
	// this allows the examples to stay examples while allowing us to
	// test them against our changes
	return await execa('npm install --no-save file:..\\/..\\/..\\/', {
		cwd: dir,
		...config
	});
}

// run tests synchronously so we can see which one threw an error
function test(dir) {
	return execa('npm test', { cwd: dir, ...config });
}

Promise.all(exampleDirs.map(install))
	.then(async () => {
		for (const dir of exampleDirs) {
			await test(dir);
		}

		// Return successful exit
		process.exit();
	})
	.catch(err => {
		console.error(err);
		process.exit(1);
	});