svelte/test/custom-elements/samples/no-svelte-options/test.js

import * as assert from 'assert';
import CustomElement from './main.svelte';

export default function (target) {
	customElements.define('no-tag', CustomElement);
	target.innerHTML = `<no-tag name="world"></no-tag>`;

	const el = target.querySelector('no-tag');
	const h1 = el.shadowRoot.querySelector('h1');

	assert.equal(h1.textContent, 'Hello world!');
}