javascript - 在 AngularJS 事件单元测试中模拟事件对象

Question

我有以下测试:

    it('Should keep location when user rejects confirmation', inject(function ($controller, $rootScope) {
        var confirmStub = sinon.stub(),
            eventStub = {
                preventDefault: sinon.spy()
            };

        miscServiceStub = function () {
            this.confirm = confirmStub;
        };

        confirmStub.returns(false);

        initializeController($controller, 'Builder', $rootScope);

        $rs.$broadcast('$locationChangeStart', eventStub);
        expect(confirmStub).toHaveBeenCalledOnce();
        expect(confirmStub).toHaveBeenCalledWith('Are you sure you want to leave? you will loose any unsaved changes.');
        expect(eventStub.stopPropagation).toHaveBeenCalledOnce();

        miscServiceStub = function () {};
    }));

测试这段代码:

$rootScope.$on('$locationChangeStart', function (event) {
    dump(arguments);
    if (!$miscUtils.confirm('Are you sure you want to leave? you will loose any unsaved changes.')){
        event.preventDefault();
    }
});

event.$stopPropagation 不调用模拟事件，并且 dump(arguments) 显示它在真实事件对象之后被传递到事件中:

Chromium 31.0.1650 (Ubuntu) DUMP: Object{
    0: Object{name: '$locationChangeStart', targetScope: Scope{$id: ..., $$childTail: ..., $$childHead: ..., $$prevSibling: ..., $$nextSibling: ..., $$watchers: ..., $parent: ..., $$phase: ..., $root: ..., this: ..., $$destroyed: ..., $$asyncQueue: ..., $$postDigestQueue: ..., $$listeners: ..., $$isolateBindings: ..., activeTab: ..., routeParams: ...}, preventDefault: function () { ... }, defaultPrevented: false, currentScope: Scope{$id: ..., $$childTail: ..., $$childHead: ..., $$prevSibling: ..., $$nextSibling: ..., $$watchers: ..., $parent: ..., $$phase: ..., $root: ..., this: ..., $$destroyed: ..., $$asyncQueue: ..., $$postDigestQueue: ..., $$listeners: ..., $$isolateBindings: ..., activeTab: ..., routeParams: ...}}, 
    1: Object{stopPropagation: spy}
}

我怎样才能使事件对象成为模拟事件而不是真实事件对象本身？我以正确的方式接近这个吗？我是 Angular 的新手，非常感谢对代码/测试的任何评论。

如果您需要更多相关代码，请告诉我。

Answer 1

$scope.$broadcast 返回 Event 对象，因此您可以这样做:

var event = $scope.$broadcast("someEvent");
expect(event.defaultPrevented).toBeTruthy();