pool.onEntityReleased checks if the entity is destroyed

Entitas/Entitas/Pool.cs

@@ -156,6 +156,9 @@ protected void updateGroupsComponentReplaced(Entity entity, int index, IComponen
         }
 
         protected void onEntityReleased(Entity entity) {
+            if(entity._isEnabled){
+                throw new EntityIsNotDestroyedException();
+            }
             entity.OnEntityReleased -= _cachedOnEntityReleased;
             _retainedEntities.Remove(entity);
             _reusableEntities.Push(entity);
@@ -167,5 +170,11 @@ public PoolDoesNotContainEntityException(Entity entity, string message) :
             base(message + "\nPool does not contain entity " + entity) {
         }
     }
+
+    public class EntityIsNotDestroyedException : Exception {
+        public EntityIsNotDestroyedException() :
+            base("Entity is not destroyed yet!") {
+        }
+    }
 }
 

Tests/Tests/Entitas/describe_Pool.cs

@@ -165,6 +165,11 @@ void when_created() {
                 reusedEntity.should_be_same(e);
                 didDispatch.should_be(1);
             };
+
+            it["throws if Entity is released before it is destroyed"] = expect<EntityIsNotDestroyedException>(() => {
+                var e = pool.CreateEntity();
+                e.Release();
+            });
 
             it["dispatches OnGroupCreated when creating a new group"] = () => {
                 Group eventGroup = null;