Entitas.Context.CreateEntity C# (CSharp) Method

        public virtual Entity CreateEntity()
        {
            var entity = _reusableEntities.Count > 0
                    ? _reusableEntities.Pop()
                    : new Entity( _totalComponents, _componentPools, _contextInfo);
            entity._isEnabled = true;
            entity._creationIndex = _creationIndex++;
            entity.Retain(this);
            _entities.Add(entity);
            _entitiesCache = null;
            entity.OnComponentAdded +=_cachedEntityChanged;
            entity.OnComponentRemoved += _cachedEntityChanged;
            entity.OnComponentReplaced += _cachedComponentReplaced;
            entity.OnEntityReleased += _cachedEntityReleased;

            if(OnEntityCreated != null) {
                OnEntityCreated(this, entity);
            }

            return entity;
        }

    public void ensures_same_deterministic_order_when_getting_entities_after_DestroyAllEntities()
    {
        var context = new Context(1);

        const int numEntities = 10;
        for (int i = 0; i < numEntities; i++) {
            context.CreateEntity();
        }

        var order1 = new int[numEntities];
        var entities1 = context.GetEntities();
        for (int i = 0; i < numEntities; i++) {
            order1[i] = entities1[i].creationIndex;
        }

        context.DestroyAllEntities();
        context.ResetCreationIndex();

        for (int i = 0; i < numEntities; i++) {
            context.CreateEntity();
        }

        var order2 = new int[numEntities];
        var entities2 = context.GetEntities();
        for (int i = 0; i < numEntities; i++) {
            order2[i] = entities2[i].creationIndex;
        }

        for (int i = 0; i < numEntities; i++) {
            var index1 = order1[i];
            var index2 = order2[i];

            Assert.AreEqual(index1, index2);
        }
    }