svelte/test/runtime/samples/key-block-array-immutable/_config.js

export default {
	html: `<div>1</div>`,
	async test({ assert, component, target, window }) {
		let div = target.querySelector("div");
		await component.append(2);
		assert.htmlEqual(target.innerHTML, `<div>1</div>`);
		assert.strictEqual(div, target.querySelector("div"));

		div = target.querySelector("div");

		component.array = [3, 4];
		assert.htmlEqual(target.innerHTML, `<div>3,4</div>`);
		assert.notStrictEqual(div, target.querySelector("div"));
	}
};