svelte/test/runtime/samples/immutable-root/_config.js

export default {
	immutable: true,
	html: `<div><h3>Called 0 times.</h3></div>`,

	test(assert, component, target, window) {
		component.observe('foo', foo => {
			component.set({ count: component.get('count') + 1 });
		});

		assert.htmlEqual(target.innerHTML, `<div><h3>Called 1 times.</h3></div>`);

		component.set({ foo: component.get('foo') });
		assert.htmlEqual(target.innerHTML, `<div><h3>Called 1 times.</h3></div>`);
	}
};