Tagged “jest”
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="hello.name" type="text">
<button data-action="click->hello#greet">
Greet
</button>
<span data-target="hello.output">
</span>
</div>
`;
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='hello.name']");
const greetButton = document.querySelector("button");
// Change the input value and click the greet button
nameInput.value = "Laurence";
greetButton.click();
// Check we have the correct greeting
expect(helloOutput).toHaveTextContent("Hello, Laurence!");
})
})See all tags.