svelte/test/runtime/samples/key-block-2/_config.js

// with reactive content beside `key`
export default {
	html: `<div>00</div>`,
	async test({ assert, component, target, window }) {
		const div = target.querySelector('div');
		component.reactive = 2;
		assert.htmlEqual(target.innerHTML, `<div>02</div>`);
		assert.strictEqual(div, target.querySelector('div'));

		component.value = 5;
		assert.htmlEqual(target.innerHTML, `<div>52</div>`);
		assert.notStrictEqual(div, target.querySelector('div'));
	}
};