Testing with Ajax

Testing with Ajax

I am a newbie to QUnit. I want to test the ValidatePhoneNumber function which has a callback as follows. Would anyone help me to write a test in QUnit for this function? Thanks

ValidatePhoneNumber: function (userName, successCallback, errorCallback) {
        VaultModel.callService(successCallback, errorCallback);
}   
   
callService: function (successCallback, errorCallback) {
        $.support.cors = true;
        $.mobile.allowCrossDomainPages = true;
        $.ajax({
            success: successCallback,
            error: errorCallback
        });
}