Mocking promises in Angular Karma/Jasmine tests

test.js

(function () {
  'use strict';

  describe('The service', () => {

    let service, scope;
    const resolveValue = 'The value you want to resolve.';
    const mock = {
      promise: () => {
        return {
          then: cb => cb(resolveValue)
        }
      }
    };

    // load the application module and provide the mock
    beforeEach(module('myModule', ($provide) => {
      $provide.value('myMock', mock);
    }));

    // inject the service
    beforeEach(inject(function (_myService_, $rootScope) {
      service = _myService_;
      scope = $rootScope;
      // spy on the promise
      spyOn(mock, 'promise').and.callThrough();
    }));

    describe('when permission are not granted', () => {
      it('should request permission', () => {
        service.doSomething();
        expect(mock.promise).toHaveBeenCalled();
        scope.$apply(); // this resolve the promise
        expect(something).to...
      });
    });

  });

})();

using_spyes_and_$q.js

(function () {
  'use strict';

  describe('The service', () => {

    let service, scope, mock, deferred;

    // load the application module and provide the mock
    beforeEach(module('myModule', ($provide) => {
      $provide.value('myMock', mock);
    }));

    // inject the service
    beforeEach(inject(function (_myService_, $rootScope, $q) {
      service = _myService_;
      scope = $rootScope;
      
      // create the promise
      mock = {
        promise: jasmine.createSpy('query').and.callFake(function(){
          return deferred.promise;
        });
      };
    }));

    describe('when permission are not granted', () => {
      it('should request permission', () => {
        service.doSomething();
        expect(mock.promise).toHaveBeenCalled();
        scope.$apply(); // this resolve the promise
        expect(something).to...
      });
    });

  });

})();