svelte/test/runtime/samples/transition-js-aborted-outro-in-each/_config.js

export default {
	data: {
		things: [
			'one',
			'two',
			'three'
		]
	},

	test(assert, component, target, window, raf) {
		const { things } = component.get();

		component.set({ things: [] });
		const spans = target.querySelectorAll('span');

		raf.tick(25);
		assert.equal(spans[0].foo, 0.75);
		assert.equal(spans[1].foo, undefined);
		assert.equal(spans[2].foo, undefined);

		raf.tick(125);
		assert.equal(spans[0].foo, 0);
		assert.equal(spans[1].foo, 0.25);
		assert.equal(spans[2].foo, 0.75);

		component.set({ things });
		raf.tick(225);

		assert.htmlEqual(target.innerHTML, `
			<span>one</span>
			<span>two</span>
			<span>three</span>
		`);

		assert.equal(spans[0].foo, 1);
		assert.equal(spans[1].foo, 1);
		assert.equal(spans[2].foo, 1);
	},
};