public void ArchetypeRemoveHolesTest()
{
EcsWorld world = new EcsWorld();
IEcsArchetype archetype = world.GetArchetype <ComponentA, ComponentB>();
IEcsEntity entity0 = world.CreateEntity(new ComponentA(), new ComponentB());
IEcsEntity entity1 = world.CreateEntity(new ComponentA(), new ComponentB());
IEcsEntity entity2 = world.CreateEntity(new ComponentA(), new ComponentB());
IEcsEntity entity3 = world.CreateEntity(new ComponentA(), new ComponentB());
entity1.RemoveComponent <ComponentA>();
entity2.RemoveComponent <ComponentA>();
Assert.AreEqual(2, archetype.EntitiesCount);
Assert.AreEqual(entity0, archetype[0]);
Assert.AreEqual(entity3, archetype[1]);
entity0.RemoveComponent <ComponentA>();
Assert.AreEqual(1, archetype.EntitiesCount);
Assert.AreEqual(entity3, archetype[0]);
entity1.AddComponent(new ComponentA());
entity2.AddComponent(new ComponentA());
Assert.AreEqual(3, archetype.EntitiesCount);
Assert.AreEqual(entity3, archetype[0]);
Assert.AreEqual(entity1, archetype[1]);
Assert.AreEqual(entity2, archetype[2]);
}
