def test_iadd(self, evt):
        rval = event.ReturnValue(append_events=[evt])
        rval2 = event.ReturnValue(eat=True, append_events=[evt])
        rset = event.ResultSet()

        rset += rval
        rset += rval2
        rset += None
        assert rset.eat
        assert rset.append_events == [evt, evt]
def add_forum(category_id=None):
    form = AddForumForm()

    if form.validate_on_submit():
        form.save()
        flash(_("Forum added."), "success")
        return redirect(url_for("management.forums"))
    else:
        form.groups.data = Group.query.order_by(Group.id.asc()).all()
        if category_id:
            category = Category.query.filter_by(id=category_id).first()
            form.category.data = category

    return render_template("management/forum_form.html", form=form,
                           title=_("Add Forum"))