Add detailed debug logging to diagnose query issue

- Log before/after Init in test to verify entity state
- Log detailed GroupResultEnumerator constructor flow
- Check Components array state and bitIdx values
- Verify archetype matching count

This will identify why GroupOf finds 0 entities in CI but 1 locally.

Author: JasonXuDeveloper

EasyEcs.Core/Enumerators/GroupResultEnumerator.1.cs

@@ -33,8 +33,12 @@ public GroupResultEnumerator(Context context)
         _entityIndexInArchetype = 0;
         Current = default;
 
+        Console.WriteLine($"GroupResultEnumerator<{typeof(T).Name}>: Starting query");
+
         if (context.TagRegistry.TryGetTagBitIndex<T>(out var bitIdx))
         {
+            Console.WriteLine($"GroupResultEnumerator<{typeof(T).Name}>: Found bitIdx = {bitIdx}");
+
             // Safely access Components array (may not be initialized yet)
             if (context.Components != null && bitIdx < context.Components.Length)
             {
@@ -46,8 +50,17 @@ public GroupResultEnumerator(Context context)
 
                 // Get matching archetypes from cache (O(1) after first access)
                 _matchingArchetypes = context.GetMatchingArchetypes(queryTag);
+                Console.WriteLine($"GroupResultEnumerator<{typeof(T).Name}>: Found {_matchingArchetypes.Count} matching archetypes");
+            }
+            else
+            {
+                Console.WriteLine($"GroupResultEnumerator<{typeof(T).Name}>: Components is null or bitIdx out of range. Components != null: {context.Components != null}, Components.Length: {context.Components?.Length ?? -1}, bitIdx: {bitIdx}");
             }
         }
+        else
+        {
+            Console.WriteLine($"GroupResultEnumerator<{typeof(T).Name}>: TryGetTagBitIndex returned false");
+        }
     }
 
     public GroupResultEnumerator<T> GetEnumerator() => this;

EasyEcs.UnitTest/SimpleTest.cs

@@ -30,14 +30,20 @@ public async Task TrivialTest()
 
         // Add components to the entity (immediate execution - no callbacks!)
         entity.AddComponent<SizeComponent>();
-        entity.AddComponent<ScaleComponent>(); // ResizeSystem will set factor to 2 in its OnInit
+        var scaleCompRef = entity.AddComponent<ScaleComponent>(); // ResizeSystem will set factor to 2 in its OnInit
+
+        Console.WriteLine($"Before Init: Entity {entity.Id} has ScaleComponent: {entity.HasComponent<ScaleComponent>()}");
+        Console.WriteLine($"Before Init: ScaleComponent.Factor = {scaleCompRef.Value.Factor}");
 
         // Start the context, automatically initializing all systems,
         // then when it is out of scope, it will dispose the context
         await using (await ctx.Init())
         {
             var entityById = ctx.GetEntityById(0);
 
+            Console.WriteLine($"After Init: Entity {entityById.Value.Id} has ScaleComponent: {entityById.Value.HasComponent<ScaleComponent>()}");
+            Console.WriteLine($"After Init: ScaleComponent.Factor = {entityById.Value.GetComponent<ScaleComponent>().Value.Factor}");
+
             // Check if factor is 2, implying ResizeSystem has set it in its OnInit
             Assert.That(entityById.Value.GetComponent<ScaleComponent>().Value.Factor, Is.EqualTo(2));