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

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

	test(assert, component, target, window) {
		var nested = component.refs.nested;
		nested.on('state', ({ changed }) => {
			if (changed.foo) {
				nested.set({ count: nested.get().count + 1 });
			}
		});

		assert.htmlEqual(target.innerHTML, `<div><h3>Called 0 times.</h3></div>`);

		nested.set({ foo: nested.get().foo });
		assert.htmlEqual(target.innerHTML, `<div><h3>Called 0 times.</h3></div>`);
	}
};