Mocking a Function that is called on a AJAX call with Jasmine

I have a function that makes an AJAX call to a service. I'm attempting to expect that the displayError function is called on a failure.

I have my function ajaxCall that accepts a url. Upon success I pass the result to displaySuccess and when there's an error I pass the details to displayError.

function ajaxCall(url) {
    $.ajax({
        method: "GET",
        url: url,
        data: "json",
        beforeSend: function (xhr) {
            //Do Stuff
        },
        error: function(xhr, textStatus, errorThrown) { displayError(xhr, textStatus, errorThrow, url)},
        success: function (results) { displaySuccess(result) }
    });
}

function displayError(xhr, textStatus, errorThrow, url) { 
    //Do Stuff// 
}
function displaySuccess(results) { 
    //Do Stuff// 
}

In Jasmine I have it successfully verifying the URL. My problem is in testing to insure that the displayError and displaySuccess functions are called.

I have the following for this specific issue so far.

describe('The ajaxCall component', function() {
    it('should call the error function when the ajax call fails', function () {
        var obj = {};
        spyOn(obj, 'displayError');

        spyOn($, "ajax").and.callFake(function (options) {
            options.error();

        });


        ajaxCall('/myResource/get');
        expect(obj.method).toHaveBeenCalled();
    });
}

I'm a little new to unit testing and I've searched trying to find suggestions that would help but they make the unit test fail. Where am I going wrong with this?