gistfile1.js

'use strict';

var fetch = require('node-fetch');
var assert = require('power-assert');

function fetchPost() {
    return fetch("http://jsonplaceholder.typicode.com/posts/1")
        .then(function(res) {
            return res.json();
        }).catch(function(e) {
            throw e;
        });
}

describe('fetch & promise & power-assert', function () {
    it("should fetch post", function (done) {
        fetchPost()
            .then(function(post) {
                assert(post.id === 2) // fail
                done();
            }).catch(done);
    });
});