Sinon.js mocked object not acknowledging calls to methods if invoked directly as callbacks of jQuery.delegate

gistfile1.txt

test("Handler is invoked as callback from jQuery delegate method directly...", function() {
    var Controller,
        View,
        $el,
        c,
        v,
        mock;

    Controller = function() {
        var self = {};

        self.handler = function(e) {
            console.log("got handled");
        };

        return self;
    };

    View = function($el, controller) {
        var self = {};

        self.render = function() {
            $el.html("<input name=\"derp\" type=\"text\" id=\"derp\"/>");

            $el.delegate("#derp", "keyup", controller.handler);
        };

        return self;
    };

    $el  = jQuery("<div></div>");
    c    = new Controller();
    v    = new View($el, c);
    mock = this.mock(c);

    v.render();

    mock.expects("handler").once();

    $el.find("input").val("bar").trigger("keyup");
    equal($el.find("input").val(), "bar"); // passes!

    mock.verify();
});

test("Handler is invoked inside anonymous function...", function() {
    var Controller,
        View,
        $el,
        c,
        v,
        mock;

    Controller = function() {
        var self = {};

        self.handler = function(e) {
            console.log("got handled");
        };

        return self;
    };

    View = function($el, controller) {
        var self = {};

        self.render = function() {
            $el.html("<input name=\"derp\" type=\"text\" id=\"derp\"/>");

            $el.delegate("#derp", "keyup", function(e) {
                controller.handler(e);
            });
        };

        return self;
    };

    $el  = jQuery("<div></div>");
    c    = new Controller();
    v    = new View($el, c);
    mock = this.mock(c);

    v.render();

    mock.expects("handler").once();

    $el.find("input").val("bar").trigger("keyup");
    equal($el.find("input").val(), "bar"); // passes!

    mock.verify();
});