svelte/packages/svelte/tests/runtime-legacy/samples/keyed-each-dev-unique-prod/_config.js

import { flushSync } from 'svelte';
import { test } from '../../test';

export default test({
	test({ assert, target }) {
		let button = target.querySelector('button');

		button?.click();

		assert.throws(flushSync, /each_key_duplicate/);
	}
});