How to mock a service in Sails, found at https://github.com/fdvj/wolfpack/issues/2

sails-mock

var sinon = require('sinon'),
    wolfpack = require('wolfpack');

// Mock EmailSender
global.EmailSender {
  sendEmailToUser: sinon.stub()
};

// Instantiate you model
global.User = wolfpack('path_to_models/User');

// Load your controller
var UserController = require('path_to_controllers/UserController');

describe('UserController', function() {

  describe('#register', function(){

    var req, res;
    beforeEach(function(){
      // Mock your response obj
      res = {
        json: sinon.stub()
      };
    });

    it("should send an email to the user", function(){

      // Mock you request object so that it passes your validations
      req = {
        body: {
          email: 'my@email.com',
          password: 'F734nmh!.rue',
          confirmPassword: 'F734nmh!.rue'
        }
      };

      var user = req.body;

      // Since you are testing create, User.find shouldn't find anything,
      // so clear any wolfpack results just in case
      wolfpack().clearResults();

      // Now set the results for your create
      wolfpack().setCreateResults(user);

      // Now we can do our asynchronous test

      runs(function(){
        UserController.register(req, res);
      });

      waitsFor(function(){
        return User.create.called;
      });

      runs(function(){
        // Now we can test if the proper arguments were passed to your
        // EmailSender service
        var params = EmailSender.sendEmailToUser.lastCall.args;
        expect(params[0].email).toBe(user.email);
        expect(params[1]).toBe('activateNewUser');
        // etc...
      });

    });

  });

});