How should I access an element's angularjs $ngModelController in a jasmine unit test?

All we need is an easy explanation of the problem, so here it is.

I’m currently using directiveElement.data("$ngModelController") to get access to the element’s $ngModelController, as in the following example.

describe("directiveElement", function () {
  it("should do something with ngModelController", inject(function($compile, $rootScope) {
    var directiveElement = $compile("<input ng-model="myNgModel" customDirective type="text"></input>")($rootScope);
    $rootScope.$digest();
    var ngModelCtrl = directiveElement.data("$ngModelController");
    ngModelCtrl.$modelValue = "12345";
    // do rest of test
  }));
});

However, I want to know if there is a better to access the $ngModelController, or if accessing the $ngModelController is a bad idea?

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

You could also do directiveElement.controller('ngModel').

I certainly think there are legitimate testing reasons why you would want a handle on this, though the more common way is to get a handle on it through the form (eg. https://github.com/angular/angular.js/blob/master/test/ng/directive/formSpec.js)

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

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