public void CanRenameGroup(GroupService<HierarchicalGroup> service, string tenant, string name,
                string newName)
            {
                var group = service.Create(tenant, name);

                service.ChangeName(group.ID, newName);

                var fromDb = service.Get(group.ID);

                fromDb.ShouldNotBe(null);
                fromDb.Name.ShouldBe(newName);
            }