svelte/test/runtime/samples/component-events-data/_config.js

export default {
	test({ assert, component, target, window }) {
		const buttons = target.querySelectorAll('button');
		const click = new window.MouseEvent('click');

		const selected = [];

		component.$on('select', event => {
			selected.push(event.detail);
		});

		buttons[1].dispatchEvent(click);
		buttons[2].dispatchEvent(click);
		buttons[1].dispatchEvent(click);
		buttons[0].dispatchEvent(click);

		assert.deepEqual(selected, [
			'bar',
			'baz',
			'bar',
			'foo'
		]);
	}
};