Use findChild to test role names in models

The unit tests for the model are incomplete in particular when it comes to testing role names because at the time I didn't find a way to properly retrieve values from delegates. I've learnt about a method we can use:

import Ubuntu.Test 0.1

UbuntuTestCase {
    when: windowShown

ListView {
    delegate: Item {
    objectName: "roleItem"
    property bool roleEnabled: model.enabled

test_modelRoles () {
    verify(testModel.count > 0, "alarm added");
    var item = findChild(roleTest, "roleItem");
    verify(item, "has children");
    verify(item.roleEnabled !== undefined, "enabled is defined");
}