Brent has some thoughts on strong and weakly typed programming languages. Starting point: a simple function that needs testing: rgbToHex(red, green, blue) { // … } Testing the result the function should return is easy. But what about edge cases? What happens though if we pass doubles instead of integers? Or numbers outside of the […]
Tag Archives: testing
Speeding up Your PHPUnit tests
Some nice tips by Tim MacDonald on how to speed up your PHPUnit tests! Having a fast test suite can be just as important as having a fast application. As a developer, getting feedback quickly about the state of your code allows for a much quicker development turnaround. Here we are going to run through […]
Run your tests using Jest & Puppeteer with jest-puppeteer
With jest-puppeteer – and its included expect-puppeteer assertion library – it’s possible to use Puppeteer within your Jest tests. Writing integration test can be done using Puppeteer API but it can be complicated and hard because API is not designed for testing. To make it simpler, an expectPage() is automatically installed and available, it provides […]
Automatic visual diffing with Puppeteer
A few years ago we got Wraith and Huxley to perform visual regression testing. Monica Dinculescu has created a likewise thingy, powered by Puppeteer: I did a little song-and-dance that sets up Puppeteer, takes screenshots of your app (like, all the routes you care about), and then compares them to the “golden” ones. If they […]
End-to-end Tests that Don’t Suck with Puppeteer
Good introduction to using Puppeteer for your e2e tests: One of the most popular tools for e2e testing is Selenium, which is a tool for automating web browsers. Selenium sounds cool in theory: write one set of tests that run on all browsers and devices, woohoo! Jk. In practice, Selenium tests are slow, brittle, and […]
Gremlins.js – Monkey testing library for web apps and Node.js
gremlins.js is a monkey testing library written in JavaScript, for Node.js and the browser. Use it to check the robustness of web applications by unleashing a horde of undisciplined gremlins. I especially like the syntax to start a test: var horde = gremlins.createHorde(); horde.unleash(); And oh, make sure you don’t run any tests after midnight […]
Detox: E2E Testing in React Native
High velocity native mobile development requires us to adopt continuous integration workflows, which means our reliance on manual QA has to drop significantly. Detox tests your mobile app while it’s running in a real device/simulator, interacting with it just like a real user. Here’s a sample test for a login screen: describe(‘Login flow’, () => […]
Puppeteer – Headless Chrome Node API
Puppeteer is a Node library which provides a high-level API to control headless Chrome over the DevTools Protocol. It can also be configured to use full (non-headless) Chrome. const puppeteer = require(‘puppeteer’); (async () => { const browser = await puppeteer.launch(); const page = await browser.newPage(); await page.goto(‘https://example.com’); await page.screenshot({path: ‘example.png’}); browser.close(); })(); Puppeteer – […]
An Overview of JavaScript Testing in 2017
This short guide is intended to catch you up with the most important reasoning, terms, tools, and approaches to JavaScript testing. It combines many great recently written articles about some aspects discussed here and adds a little more from our experience. That first sentence is a lie though, nothing “short” about this grand overview ;). […]
Jest – Painless JavaScript Testing
I’ve been hearing great things about Jest lately. It’s worth checking it out: Jest is a JavaScript testing framework, used by Facebook to test all JavaScript code including React applications. Install Jest using npm (along with some extra Babel presets if you’re writing ES2015 – Don’t forget to configure Babel using .babelrc to use the […]