Mocking Ext.Ajax with Jasmine spies

describe("Mocking Ext.Ajax.request with Jasmine", function () {

    var responseText,
        mockResponse = {
            responseText: '{"success":true,"count":1,"data":[{name: "id", "type": "int", "maxLenght": "11", "isPrimaryKey": true}]}'
        };

    it("should mock the Ext.Ajax.request response manipulating the spy mostRecentCall.args", function () {

        spyOn(Ext.Ajax, 'request');

        Ext.Ajax.request({
            url    : '/testurl',
            params : {
                dbName   : 'test',
                tableName: 'table1'
            },
            success: function (response, opts) {
                responseText = Ext.JSON.decode(response.responseText);
            }
        });
        Ext.Ajax.request.mostRecentCall.args[0].success(mockResponse);
        expect(responseText.success).toBe(true);
        expect(responseText.count).toBe(1);
        expect(responseText.data[0].type).toBe("int");
    });

    it("should mock a Ext.Ajax.request function wrapper returning the response via callback", function () {

        var callbackFn = function (response) {
            responseText = Ext.JSON.decode(response.responseText);
        };

        var requestFunction = function (callback) {
            console.log("This text will never be logged out");
            Ext.Ajax.request({
            });
        };

        requestFunction = jasmine.createSpy().andCallFake(function (callback) {
                callback(mockResponse);
            }
        );
        requestFunction(callbackFn);
        expect(responseText.success).toBe(true);
        expect(responseText.count).toBe(1);
        expect(responseText.data[0].type).toBe("int");
    });
});