svelte/test/runtime/samples/internal-state/_config.js

export default {
    html: `
        <p>internal: 1</p>
        <button>click me</button>
    `,

    async test({ assert, target, window }) {
        const button = target.querySelector('button');
        const click = new window.MouseEvent('click');

        await button.dispatchEvent(click);

        assert.htmlEqual(target.innerHTML, `
            <p>internal: 1</p>
            <button>click me</button>
        `);
    }
};