//module declaration
angular.module('decorationModule',[
        'originalModule','ExternalService'
    ])
    //decoration
    .decorator('$controller',function ($delegate,ExternalService) {
        return function () {
            //check when the OriginalCtrl is instantiated
            if (arguments[0] === 'OriginalCtrl') {
                return function () {
                    const ctrl = $delegate.apply($delegate,arguments)();
                    //memorize the original close function
                    const delegatedCloseFn = ctrl.closefn;
                    ctrl.close = function close() {
                        alert('bye bye before closing');
                        ExternalService.fn();
                        delegatedCloseFn();
                        alert('bye bye After closing');
                    };
                    return ctrl;
                }
            }
            else {
                return $delegate.apply($delegate,arguments);
            }
        }
    });

它运作良好.

但是,尝试对其进行单元测试：

beforeEach(angular.mock.module('decorationModule',($controller,$q,ExternalService) => {
    scope = $rootScope.$new();

    createController = () => {
        return $controller('OriginalCtrl',{$scope: scope});
    };
    spyOn(ExternalService,'fn').and.returnValue();
}));

it('should call decorated close function',inject((ExternalService) => {
    //given
    const ctrl = createController();
    expect(ExternalService.fn).not.toHaveBeenCalled();

    //when
    ctrl.close();
    //then
    expect(ExternalService.fn).toHaveBeenCalled();
}));

我收到一个错误：

forEach@/home/…/bower_components/angular/angular.js:322:24
loadModules@/home/…/bower_components/angular/angular.js:4548:12
createInjector@/home/…/bower_components/angular/angular.js:4470:30
workFn@/home/…/bower_components/angular-mocks/angular-mocks.js:2954:60