package.json

{
  "name": "sup",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "scripts": {
    "test": "ava"
  },
  "devDependencies": {
    "ava": "^0.21.0"
  }
}

test.js

'use strict';

const test = require('ava');

test('should succeed', async () => {
    await new Promise((_, reject) => {
        setTimeout(reject, 100);
    });
});