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.$on('state', ({ changed }) => {
			if (changed.foo) {
				component.count = component.count + 1;
			}
		});

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

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