javascript - 使用 Backbone 和 Jasmine 测试自定义事件与回调函数的绑定(bind)

Question

我正在尝试测试以确保在显示对话框时绑定(bind)自定义事件。这是我的代码:

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

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

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

注意:setupListener 是一个私有(private)函数。这是我的有效测试代码:

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

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

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

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

    });

但现在我想检查“on”函数是否使用正确的参数调用:

    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);

    });

但我收到错误:

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

问题似乎出在处理程序上。如何检查处理程序是否调用了“on”函数？

Answer 1

您应该将处理程序函数包装如下:

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