Hello world: node.js & jasmine-node

hello.js

function hello_world() {return "Hello, world!";}
exports.hello_world = hello_world;

test_hello.spec.js

var hello = require('../hello');

describe('hello_world', function() {
  it('should return hello world', function() {
    var returned_string = hello.hello_world();
    expect(returned_string).toEqual("Hello, world!");
  });

});