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

export default {
	test({ assert, component, target, window, raf }) {
		component.visible = true;
		const div = target.querySelector('div');
		assert.strictEqual(div.style.opacity, '0');

		raf.tick(50);
		assert.strictEqual(div.style.opacity, '');
	}
};