Jasmine: Testing a function returning a promise

I am writing tests using Jasmine for my angular application. All the tests are passing. My class looks like follows:

class xyz implements ng.IComponentController {

  private myList: ng.IPromise<MyList[]> ;

  //declare necessary variables

  /* @ngInject */

  constructor(private ListService: ListService,

              ) {

    this.myList = this.ListService.getList();

  }



  public onChange(): void {

    this.isNameUnique(this.name).then(function(unique){

      scope.isUnique = unique;

      scope.errorNameInput = !reg.test(scope.name) || !scope.isUnique;

      scope.myFunction({

        //do something

      });

    });

  }



  public isNameUnique(name: string): ng.IPromise<boolean> {

    return this.myList

    .then(

      (names) => {

        _.mapValues(names, function(name){

          return name.uuid.toLowerCase();

        });

        return (_.findIndex(names, { uuid : uuid.toLowerCase() }) === -1) ?  true : false;

    });

  }

}

Here, I am using ListService to pre-populate my list in the constructor itself (so it calls the service only once). Then, in my onChange method, I am checking
if a name is unique or not. The isNameUnique is returning a boolean promise.
Now, I'm trying to get 100% coverage for my test. I'm getting confused about testing isNameUnique method here. My first test is:

(Assuming myList is a json similar to response I will get from service)

    this.$scope.myFunction = jasmine.createSpy('myFunction');

    it('should ...', function() {

      this.view.find(NAME_INPUT).val('blue').change(); // my view element.

      this.getList.resolve(myList);

      this.controller.isNameUnique('blue').then(function (unique) {

        expect(unique).toEqual(false); //since blue is already in my json

        expect(this.controller.errorNameInput).toEqual(true); //since its not unique, errornameinput will be set to true

        expect(this.$scope.myFunction).toHaveBeenCalled();

      });

    });

I would expect this test to cover the line: and invocation of but it still shows uncovered. Not sure why.

Please let me know if you see anything else wrong since I'm quite new to Angular and Jasmine. Thanks.