我正在尝试对以下代码进行单元测试，我为下面的单元测试编写了以下代码，我尝试了很多工作方式，但是我不断遇到错误：

  

“无法读取未定义的属性'num'”

我不知道为什么范围设置不正确。如果您有任何想法，能否请您提供一些建议？

var angular = require('angular');
require('angular-mocks');

describe('test directive',function () {

    let $rootscope;
    let $compile;
    let scope;
    let newScope;
    let element;

    beforeEach(angular.mock.inject(function (_$compile_,_$rootscope_) {
        $compile = _$compile_;
        $rootscope = _$rootscope_;
    }));

    describe('test directive',function () {

        beforeEach(function () {
            newScope = $rootscope.$new();
            element = $compile('<test-directive></test-directive>')(newScope);
            newScope.$digest();
            scope = element.isolateScope();
        });

        fit('scope initialized',function () {
            expect(scope.num).toEqual(1);
        });

    });
});

module.exports = module.directive('testDirective',['$rootscope','$scope',function($rootscope,$scope) {

    return {
        template: require('./test.html'),restrict: 'E',controller: [
            '$scope',function ($scope) {
                    $scope.num = 1

                    $scope.sum = function(a,b) {
                        return a + b;
                    }

            }]
    }
}]);