svelte/packages/svelte/tests/runtime-runes/samples/dynamic-transition/_config.js

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

export default test({
	before_test() {
		log.length = 0;
	},

	async test({ assert, target }) {
		const [b1, b2] = target.querySelectorAll('button');

		flushSync(() => {
			b1.click();
		});

		assert.deepEqual(log, ['transition 2']);

		flushSync(() => {
			b2.click();
		});

		assert.deepEqual(log, ['transition 2']);

		flushSync(() => {
			b1.click();
		});

		assert.deepEqual(log, ['transition 2', 'transition 1']);
	}
});