astro/packages/integrations/lit/test/server.test.js

import { expect } from 'chai';
import server from '../server.js';
import { LitElement, html } from 'lit';
import * as cheerio from 'cheerio';

const { check, renderToStaticMarkup } = server;

describe('check', () => {
	it('should be false with no component', async () => {
		expect(await check()).to.equal(false);
	});

	it('should be false with a registered non-lit component', async () => {
		const tagName = 'non-lit-component';
		customElements.define(tagName, class TestComponent extends HTMLElement {});
		expect(await check(tagName)).to.equal(false);
	});

	it('should be true with a registered lit component', async () => {
		const tagName = 'lit-component';
		customElements.define(tagName, class extends LitElement {});
		expect(await check(tagName)).to.equal(true);
	});
});

describe('renderToStaticMarkup', () => {
	it('should throw error if trying to render an unregistered component', async () => {
		const tagName = 'non-registrered-component';
		try {
			await renderToStaticMarkup(tagName);
		} catch (e) {
			expect(e).to.be.an.instanceOf(TypeError);
		}
	});

	it('should render empty component with default markup', async () => {
		const tagName = 'nothing-component';
		customElements.define(tagName, class extends LitElement {});
		const render = await renderToStaticMarkup(tagName);
		expect(render).to.deep.equal({
			html: `<${tagName}><template shadowroot="open" shadowrootmode="open"><!--lit-part--><!--/lit-part--></template></${tagName}>`,
		});
	});

	it('should render component with default markup', async () => {
		const tagName = 'simple-component';
		customElements.define(
			tagName,
			class extends LitElement {
				render() {
					return html`<p>hola</p>`;
				}
			}
		);
		const render = await renderToStaticMarkup(tagName);
		const $ = cheerio.load(render.html);
		expect($(`${tagName} template`).html()).to.contain('<p>hola</p>');
	});

	it('should render component with properties and attributes', async () => {
		const tagName = 'props-and-attrs-component';
		const attr1 = 'test';
		const prop1 = 'Daniel';
		customElements.define(
			tagName,
			class extends LitElement {
				static properties = {
					prop1: { type: String },
				};

				constructor() {
					super();
					this.prop1 = 'someone';
				}

				render() {
					return html`<p>Hello ${this.prop1}</p>`;
				}
			}
		);
		const render = await renderToStaticMarkup(tagName, { prop1, attr1 });
		const $ = cheerio.load(render.html);
		expect($(tagName).attr('attr1')).to.equal(attr1);
		expect($(`${tagName} template`).text()).to.contain(`Hello ${prop1}`);
	});
});