使用Backbone和Jasmine测试将自定义事件绑定到回调函数

Question

I'm trying to test to make sure a custom event was bound to upon showing of a dialog. Here is my code:

    setupListener = function () {
        appEvent.on('some_event', theHandler);
    };

    theHandler = function (responseData) {
        ....
    };

    this.show = function () {
        setupListener();
    };

Note: setupListener is a private function. Here's my test code that works:

    it('appEvent.on was called', function () {

        spyOn(appEvent, 'on');
        dialogView.show();

        var theHandler = function (responseData) {
        ....
        };

        expect(appEvent.on).toHaveBeenCalled('some_event', theHandler);

    });

But now I want to check the "on" function was called with correct parameters:

    it('appEvent.on was called with right parameters', function () {

        spyOn(appEvent, 'on');
        dialogView.show();

        var theHandler = function (responseData) {
        ....
        };

        expect(appEvent.on).toHaveBeenCalledWith('some_event', theHandler);

    });

But I get the error:

Expected spy on to have been called with [ 'some_event', Function ] but actual calls were [ 'some_event', Function ]

The problem looks to be with the handler. How do I check the "on" function was called with the handler?

Answer 1

您应该像这样包装处理程序函数：

expect(appEvent.on).toHaveBeenCalledWith('some_event', jasmine.any(theHandler));