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@open-wc/testing
Advanced tools
@open-wc/testing
is an opinionated package that combines and configures testing libraries to minimize the amount of ceremony required when writing tests.
npm i -D @open-wc/testing@next
Exposes all functions of @open-wc/testing-helpers, so that you have a single package to import from:
import { fixture, html } from '@open-wc/testing';
describe('my-test', () => {
it('works', async () => {
const el = await fixture(html` <my-element></my-element> `);
});
});
Exposes chai as an es module with useful plugins pre-configured:
@open-wc/semantic-dom-diff for dom tree / snapshot testing:
import { expect, fixture, html } from '@open-wc/testing';
describe('Plugin - semantic-dom-diff', () => {
it('can semantically compare full dom trees', async () => {
const el = await fixture(`<div><!-- comment --><h1>${'Hey'} </h1> </div>`);
expect(el).dom.to.equal('<div><h1>Hey</h1></div>');
});
it('can semantically compare lightDom trees', async () => {
const el = await fixture(`<div><!-- comment --><h1>${'Hey'} </h1> </div>`);
expect(el).lightDom.to.equal('<h1>Hey</h1>');
});
it('can compare against a snapshot', async () => {
const el = await fixture(`<div><!-- comment --><h1>${'Hey'} </h1> </div>`);
expect(el).dom.to.equalSnapshot();
});
});
@open-wc/chai-a11y-axe for a11y testing:
import { expect, fixture, html } from '@open-wc/testing';
describe('my-test', () => {
it('works', async () => {
const el = await fixture(html` <my-element></my-element> `);
await expect(el).to.be.accessible();
});
});
chai-dom for dom testing:
import { fixture, expect } from '@open-wc/testing';
describe('Plugin - chai-dom', () => {
it('can check for an exiting css class', async () => {
const el = await fixture(`<div class="foo bar"></div>`);
expect(el).to.have.class('foo');
});
});
FAQs
Testing following open-wc recommendations
The npm package @open-wc/testing receives a total of 39,159 weekly downloads. As such, @open-wc/testing popularity was classified as popular.
We found that @open-wc/testing demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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