Evaluate the advancement of a test using a promise notification for $httpBackend

I am currently utilizing a file upload feature from https://github.com/danialfarid/angular-file-upload in my project. This library includes a progress method that is triggered when the xhr request receives the progress event. Here is an excerpt from the source code of angular-file-upload:

xhr.upload.addEventListener('progress', function(e) {
    deferred.notify(e);
}, false);

My challenge now lies in testing this using $httpBackend. I am able to test the success and error scenarios with

$httpBackend.expectPOST("http://localhost:9001/").respond('ok');
$httpBackend.expectPOST("http://localhost:9001/").respond(500, 'some error');

However, I am struggling to trigger the notify function of the promise. Is there a way to achieve this?

EDIT

The specific section I want to test resides within the progress method:

    $upload.http({url: url, method: 'POST', data: file})
    .progress(function(evt) {

      // There is additional code here that requires testing

      self.$deferreds.upload.notify((100.0 * evt.loaded / evt.total).toFixed(2));
    }).success(function(data, status, headers, config) {
      self.$deferreds.upload.resolve(data);
    }).error(function(response) {
      self.$deferreds.upload.reject(response);
    });
javascriptangularjs

Answer №1

If you need to monitor the $upload.http function and create a fake object that allows you to set progress, success, and error callbacks, you can do so using the following code:

spyOn($upload, 'http').andReturn({
  progress: function (progressCallback) {
    this.progressCallback = progressCallback;
  },
  success: function (errorCallback) {
    this.errorCallback = errorCallback;
  },
  error: function (errorCallback) {
    this.errorCallback = errorCallback;
  }
});

After setting up the mocked object, you can then trigger these callback functions synchronously in your tests like this:

it('should perform a specific action', function () {
  $upload.progressCallback();
  // or $upload.successCallback();
  // or $upload.errorCallback();

  expect('this').toBe('that');
});

Answer №2

Are unit-tests our topic of discussion today?

Is there a necessity to test third-party components at all?

Simply simulate this entire section.

Perhaps I misunderstood the question, so more code is required to be tested.

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