({
    fireToastEvent : function(component, event, helper) {
        var toastEvent = $A.get("e.force:showToast");    
        toastEvent.setParams({
            "title": "Title",
            "message": "This is line 1. \n This is line 2. \n This is line 3.",
            "type": "success"
        });
        toastEvent.fire();
    }
})