AngularJs unit test - function called after promise resolved

I want to test if my service Call was successfull if the Function "search" was called.

My Controller:

function UnitTestsCtrl(homePSrv, $scope) {
    var that = this;
    this.SearchModel = {};
    this.homePSrv = homePSrv;
}

UnitTestsCtrl.prototype.Init = function() {
     var that = this;
    this.homePSrv.InitUnitTestSearchModel().then(function(result) {
        that.SearchModel = result;
        that.Search();
    });
}

angular.module("unitTestsCtrl", [])
       .controller("unitTestsCtrl", UnitTestsCtrl);

The jasmine unit test:

describe('Controller Tests: "UnitTestsCtrl"', function () {
    var ctrl, mockHomePSrv;

    beforeEach(function () {
        mockHomePSrv = jasmine.createSpyObj('homePSrv', ['InitUnitTestSearchModel']);
        module('app.main');

        inject(function ($controller, $q) {

            mockHomePSrv.InitUnitTestSearchModel.and.returnValue($q.when('InitUnitTestSearchModelData'));

            ctrl = $controller('unitTestsCtrl', {
                homePSrv: mockHomePSrv,
            });
        });
    });

  it('Funktion "Search" was called', function () {
        spyOn(ctrl, 'Init');
        spyOn(ctrl, 'Search');
        ctrl.Init();
        expect(ctrl.Init).toHaveBeenCalled();

        //Thats not working - its not being called
        expect(ctrl.Search).toHaveBeenCalled();

    });
});

The problem is that the expectation if the search function was called is false. I think it has to do with the promise.