svelte/test/runtime/samples/transition-css-iframe/_config.js

export default {
	skip_if_ssr: true,

	async test({ assert, component, target, raf }) {
		const frame = target.querySelector('iframe');
		await Promise.resolve();

		component.visible = true;
		const div = frame.contentDocument.querySelector('div');

		raf.tick(25);

		component.visible = false;

		raf.tick(26);
		assert.ok(~div.style.animation.indexOf('25ms'));
	}
};