public void CreateRemove()
{
var entities = new List <IEntity>();
var setManager = new SetManager(entities);
var componentManager = new ComponentManager(setManager);
var entity = new Entity(new StubEntityManager(), componentManager, "test entity")
{
new AComponent("ac")
};
entities.Add(entity);
var set = setManager.CreateSet(e => e.Contains <AComponent>());
Assert.IsTrue(set.Matches(entity));
Assert.AreEqual(1, set.Count, "set should have added existing entity");
entity.Remove <AComponent>();
Assert.IsFalse(set.Matches(entity));
Assert.AreEqual(0, set.Count, "set should have been updated by set manager");
setManager.RemoveSet(set);
entity.Add(new AComponent("ac2"));
Assert.IsTrue(set.Matches(entity));
Assert.AreEqual(0, set.Count, "set shouldn't have been updated");
}