Entitas.Context.DestroyAllEntities C# (CSharp) Method

        public virtual void DestroyAllEntities()
        {
            var entities = GetEntities();
            for (int i = 0; i < entities.Length; i++) {
                DestroyEntity(entities[i]);
            }

            _entities.Clear();

            if(_retainedEntities.Count != 0) {
                throw new ContextStillHasRetainedEntitiesException(this);
            }
        }

    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);
        }
    }