How do I test view that uses controllerAs in AngularJS

Question

I'm trying to test view of my controller but I cannot get this to work. When I try simple template as<h1>test</h1> it works but when template is using controllerAs syntax I get Expected undefined to contain 'test'. I did some research and transcludeControllers should deal with this but it don't. My test look like this:

 it('should show test section', () => {
            let candidatesCtrl = $controller('CandidatesController', mock);
            candidatesCtrl.loading = false;
            let scope = $rootScope.$new();

            let linkFn = $compile('<h1 ng-if="!candidatesCtrl.loading">test</h1>');

            let view = linkFn(scope,
                undefined, {
                    transcludeControllers: {
                        CandidatesController: {
                            instance: candidatesCtrl
                        }
                    }
                });

            scope.$digest();
            let templateAsHtml = view.html();
            expect(templateAsHtml).toContain('test');

        });

How do I get this to work? I'm using AngularJS 1.6.3 and Jasmine/Karma combo.