svelte/test/runtime/samples/transition-js-each-keyed-unchanged/_config.js

export default {
	props: {
		numbers: [1, 2, 3, 4, 5]
	},

	test({ assert, component, target }) {
		const divs1 = target.querySelectorAll('div');
		assert.equal(divs1[0].foo, undefined);

		component.numbers = [1, 2, 5, 4, 3];
		const divs2 = target.querySelectorAll('div');

		assert.equal(divs1[0], divs2[0]);
		assert.equal(divs1[1], divs2[1]);
		assert.equal(divs1[2], divs2[4]);
		assert.equal(divs1[3], divs2[3]);
		assert.equal(divs1[4], divs2[2]);

		assert.equal(divs1[0].foo, undefined);
		assert.equal(divs1[1].foo, undefined);
		assert.equal(divs1[2].foo, undefined);
		assert.equal(divs1[3].foo, undefined);
		assert.equal(divs1[4].foo, undefined);
	}
};