Creating unit tests for Angular directive that interacts with external HTML element

Here is my experimental setup. I am including two elements into the $document, with the intention of making them accessible to my directive for testing purposes.

beforeEach(inject(function ($compile, $rootScope, $document) {
   var scope = $rootScope.$new();
   var element = $compile('<div id="inputId"></div>')(scope);
   var myDirective = $compile('<div my-directive my-directive-attr="inputId"></div>')(scope)
   angular.element($document[0].body).append(element);
   angular.element($document[0].body).append(myDirective);
   scope.$digest();
});

Below is a snippet from my directive code. I am attempting to access the element on the $document based on the ID passed through the directive attribute.

angular.module('myModule',[])
.directive('myDirective', function ($document) {
  return {
    restrict: 'A',
    link: function (scope, el, attrs) {
      var inputId = attrs.myDirectiveAttr;
      var fromDocument = $document[0].getElementById(inputId);
      console.log(fromDocument);
    };
  });

When the directive runs, the console displays null. Is there an alternative solution to having elements within the $document without needing to mock the entire $document service?

Answer №1

I managed to successfully resolve this issue by paying close attention to the order in which elements are added to the $document and $compiling them.

The initial problem with the code was that the $compile function for the myDirective element was called after adding it to the $document. To rectify this, the correct approach is to:

beforeEach(inject(function ($compile, $rootScope, $document) {
  var scope = $rootScope.$new();
  var element = $compile('<div id="inputId"></div>')(scope);
  angular.element($document[0].body).append(element);      
  var myDirective = $compile('<div my-directive my-directive-attr="inputId"></div>')(scope);
});

In this scenario, the code within the 'link' method is executed during the compilation of the myDirective element. Hence, it is crucial to ensure that the initial element has already been added to the $document before invoking $compile. This guarantees that 'element' is accessible during the linking phase of the directive.

It's worth noting that, for testing purposes, the myDirective element doesn't necessarily need to be appended to $document.

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