Automated Testing

A test driven development cycle simplifies the thought process of writing code, makes it easier, and quicker in the long run.

Ava

Before we start, let's open the ./src/index.js file and write some code that can be tested.

exports.echo = function () {
  return 'Hello World';
}

Install the required packages.

$ npm i --save-dev ava

Open the ./package.json and add some configuration as shown below.

{
  "ava": {
    "files": [
      "./tests/*.js",
      "./tests/**/*.js"
    ],
    "concurrency": 5,
    "failFast": true
  },
  "scripts": {
    "test": "ava"
  }
}

Create a new file ./tests/index.js and write a simple test.

const test = require('ava');
const {echo} = require('../src');

test('returns Hello World', async (t) => {
  t.is(echo(), 'Hello World');
});

Execute the npm test command to run the test.