fakeRequest

function fakeRequest(delay=1000, result='success') {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            if (result === 'success') {
                resolve();
            }
            if (result === 'error') {
                reject();
            }
            if (result === 'random') {
                Math.floor(Math.random() * 10) < 4 ? resolve() : reject();
            }
        }, delay);
    });
}