AngularJS mocked backend demonstration, step-2

mock-delay.js

angular.module('appMock', ['ngMockE2E'])
.factory('delayHTTP', function ($q, $timeout) {
  return {
    request: function (request) {
      var delayedResponse = $q.defer();
      $timeout(function () {
        delayedResponse.resolve(request);
      }, 500);
      return delayedResponse.promise;
    },
    response: function (response) {
      var deferResponse = $q.defer();

      if (response.config.timeout && response.config.timeout.then) {
        response.config.timeout.then(function () {
          deferResponse.reject();
        });
      } else {
        deferResponse.resolve(response);
      }

      return $timeout(function () {
        deferResponse.resolve(response);
        return deferResponse.promise;
      });
    }
  };
})
// delay HTTP
.config(['$httpProvider', function ($httpProvider) {
  $httpProvider.interceptors.push('delayHTTP');
}]);