Karma config

files.js

files: [
  '../lib/ionic/js/ionic.bundle.js',
  '../lib/angular-mocks/angular-mocks.js',
  '../js/**.js',
  './**.spec.js'
],

pizza.js

function Pizza(slices){
  this.slices = slices || 8;
}

pizzaService.js

angular.module('starter.services', [])

.factory('Pizza', function($http){
  return {
    orderPizza: function(pizza){
      return $http.post('/order',pizza);
    }
  };
})

pizzaServiceTest.js

describe('Pizza Service', function(){

  var pizzaService;
  var $httpBackend;
  var orderHandler;

  beforeEach(function(){

    module('starter.services');
    inject(function($injector){
      pizzaService = $injector.get('Pizza');
      $httpBackend = $injector.get('$httpBackend');
      orderHandler = $httpBackend.whenPOST('/order').respond(200,true);
    });

  });

  it('should let me order pizza', function(){
    expect(pizzaService.orderPizza).toBeDefined();
  });

  it('should return when I order pizza', function(){
    $httpBackend.expectPOST('/order');
    var pizzaPromise = pizzaService.orderPizza(new Pizza());
    var orderComplete = false;
    pizzaPromise.then(function(data){
      orderComplete = true;
    });
    $httpBackend.flush();
    expect(orderComplete == true);
  });

  it('should handle errors', function(){
    $httpBackend.expectPOST('/order');
    orderHandler.respond(500);
    var pizzaPromise = pizzaService.orderPizza(new Pizza());
    var gotError =false;
    pizzaPromise.catch(function(){
      gotError = true;
    });
    $httpBackend.flush();
    expect(gotError == true);
  });

});

pizzaTest.js

describe('Pizza', function(){

  it("should default to 8 slices", function(){
    var p = new Pizza();
    expect(p.slices == 8);
  });

  it("should let me override the number of slices", function(){
    var p = new Pizza(12);
    expect(p.slices == 12);
  });

});