svelte/test/runtime/samples/dynamic-element-event-handler2/_config.js

let clicked = false;
function handler() {
	clicked = true;
}

export default {
	get props() {
		return { tag: 'div', handler };
	},
	html: '<div>Foo</div>',

	before_test() {
		clicked = false;
	},

	test({ assert, component, target }) {
		assert.equal(clicked, false);

		component.tag = 'button';
		const button = target.querySelector('button');
		const click = new window.MouseEvent('click');
		button.dispatchEvent(click);

		assert.equal(clicked, true);
	}
};