Delete Sharepoint group using Jsom

function DeleteWebGroup(GRPtitle) {
    var clientContext = new SP.ClientContext.get_current();
    var collGroup = clientContext.get_web().get_siteGroups();
     oGroup = collGroup.getByName(GRPtitle);
   collGroup.remove(oGroup);
    clientContext.executeQueryAsync(Function.createDelegate(this, this.onSetQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));}

function onSetQuerySucceeded() {  
    alert("Group deleted.");
}
function onQueryFailed(sender, args) {
    alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}
 var oGroup;
DeleteWebGroup("test");