Exploring Angular scope variables using Jasmine while making an ajax request

Can anyone provide guidance on testing Angular scope variables in a controller that is created within an ajax request?

Here's the setup:

app.controller('NewQuestionCtrl', function ($scope, Question) {
   loadJsonAndSetScopeVariables($scope, Question);
});

function loadJsonAndSetScopeVariables(scope, Question) {
  Question.loadJson().then(function(success) {
  var result = success.data.variables;

  scope.levels = result.levels;
  scope.tags = result.tags;
  scope.difficulties = result.difficulties;
  scope.questionTypes = result.questionTypes;
  scope.areas = result.areas;

},function(data){

 });
}

I need to test this without using mocks. I've managed to inject my Question service for testing purposes:

describe('Controller: NewQuestionCtrl', function () {

beforeEach(angular.mock.module('testmeApp'));

var NewQuestionCtrl, scope, QuestionService;

beforeEach(inject(function ($controller, $rootScope, Question) {
  scope = $rootScope.$new();
  QuestionService = Question;
  NewQuestionCtrl = $controller('NewQuestionCtrl', {
  $scope: scope
 });
}));

it('should attach a list of areas to the scope', function (done) {
  expect(scope.areas).toBeDefined();
  done();
});

If anyone has experience with this and can offer some assistance, it would be greatly appreciated.

Answer №1

To simulate a Question object for testing purposes, consider creating a mock version of it. There are multiple ways to accomplish this task, and the following is just one approach.

Alternatively, you could also opt to inject an actual instance of Question and perform spying on that instead. However, using a mock is typically recommended as it helps in isolating unit tests related to this from those pertaining to the Question itself.

var questionDeferred, myController, scope;
var mockQuestion = {
  loadJson: angular.noop
};

beforeEach(inject(function($q, $rootScope, $controller) {
  questionDeferred = $q.defer();
  scope = $rootScope.$new();
  spyOn(mockQuestion, 'loadJson').and.returnValue(questionDeferred);

  // To effectively spy on Question.loadJson(), create your controller 
  // using this method since your function is executed immediately
  myController = $controller('NewQuestionCtrl', {
    $scope: scope,
    Question: mockQuestion
  });
}));

it('should populate the scope with a list of areas', function (done) {
  questionDeferred.resolve({/*some data*/});
  scope.$digest();

  expect(scope.areas).toBeDefined();
  done();
});

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