import test from 'ava'; import sinon from 'sinon'; import { prettyPrint } from '../src/util.js'; test.beforeEach((t) => { sinon.stub(console, 'log'); }); test.afterEach((t) => { console.log.restore(); }); test('prettyPrint writes to stdout', (t) => { prettyPrint('foo'); t.true(console.log.calledOnce); });