svelte/test/runtime/samples/transition-abort/_config.js

// expect aborting halfway through outro transition
// to behave the same in `{#if}` block as in `{:else}` block
export default {
	html: `
		<div>a</div>

		<div>a</div>
	`,

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

		// abort halfway through the outro transition
		raf.tick(50);

		await component.$set({
			visible: true,
			array: ['a', 'b', 'c']
		});

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

			<div>a</div>
			<div>b</div>
			<div>c</div>
		`);
	}
};