svelte/test/runtime/samples/transition-js-dynamic-component/_config.js

export default {
	props: {
		x: true,
	},

	html: `
		<div>a</div>
	`,

	test({ assert, component, target, window, raf }) {
		component.x = false;

		assert.htmlEqual(target.innerHTML, `
			<div>a</div>
			<div>b</div>
		`);

		const [a, b] = target.querySelectorAll('div');

		raf.tick(25);

		assert.equal(a.a, 0.75);
		assert.equal(b.b, 0.25);

		raf.tick(100);

		assert.equal(a.a, 0);
		assert.equal(b.b, 1);

		assert.htmlEqual(target.innerHTML, `
			<div>b</div>
		`);
	}
};