public void ShouldSyncItsContainerWithModelParents()
{
var model_a = new Model ("a");
var model_b = new Model ("b");
var model_container = new Model("container");
var models = new ModelCollection(model_container);
models.AddRange(new [] {model_a, model_b});
Assert.That(models.Container, Is.EqualTo(model_container));
Assert.That(models.All(m => m.Parent == model_container));
models.Clear();
Assert.That(model_a.Parent, Is.Null);
Assert.That(model_b.Parent, Is.Null);
models.Add(model_a);
Assert.That(model_a.Parent, Is.EqualTo(model_container));
models.Insert(0, model_b);
Assert.That(model_b.Parent, Is.EqualTo(model_container));
models.Remove(model_a);
Assert.That(model_a.Parent, Is.Null);
}