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Tagged “testing”

Testing ES modules with Jest

Here are a few troubleshooting tips to enable Jest, the JavaScript testing framework, to be able to work with ES modules without needing Babel in the mix for transpilation. Let’s get going with a basic set-up.

Accessibility Testing (on

In this journal entry, Jeremy Keith argues that when it comes to accessibility testing it’s not just about finding issues—it’s about finding the issues at the right time.

Use Mac Zoom to show the text a screen reader gets

I picked up a good accessibility testing tip from my work colleague Max today.

On a Mac, if you open System > Accessibility > Zoom, you can enable “hover text”. This allows you to hold down command (cmd) and then whatever is under the mouse will be shown. This shows the same text that a screen reader sees so it’s good for checking if bits of the page respond to a screen reader.

Assistiv Labs

A tool for testing how accessible your experience is on various assistive technologies – perhaps “like BrowserStack but for screen readers”?

Assistiv Labs remotely connects you to real assistive technologies, like NVDA, VoiceOver, and TalkBack, using any modern web browser.

Introducing Rome

We’re excited to announce the first beta release and general availability of the Rome linter for JavaScript and TypeScript. This is the beginning of an entire suite of tools. Rome is not only a linter, but also a compiler, bundler, test runner, and more, for JavaScript, TypeScript, HTML, JSON, Markdown, and CSS. We aim to unify the entire frontend development toolchain.

Testing Stimulus Controllers

Stimulus JS is great but doesn’t provide any documentation for testing controllers, so here’s some of my own that I’ve picked up.

Required 3rd-party libraries

Basic Test

// hello_controller.test.js
import { Application as StimulusApp } from "stimulus";
import HelloController from "path/to/js/hello_controller";

describe("HelloController", () => {
beforeEach(() => {
// Insert the HTML and register the controller
document.body.innerHTML = `
<div data-controller="hello">
<input data-target="" type="text">
<button data-action="click->hello#greet">
<span data-target="hello.output">
StimulusApp.start().register('hello', HelloController);

it("inserts a greeting using the name given", () => {
const helloOutput = document.querySelector("[data-target='hello.output']");
const nameInput = document.querySelector("[data-target='']");
const greetButton = document.querySelector("button");
// Change the input value and click the greet button
nameInput.value = "Laurence";;
// Check we have the correct greeting
expect(helloOutput).toHaveTextContent("Hello, Laurence!");

Beyond Automatic Testing (

Six accessibility tests Viennese Front-end Developer Manuel Matusovic runs on every website he develops, beyond simply running a Lighthouse audit.

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