1 files changed, 71 insertions, 0 deletions
diff --git a/Plugins/MonoGame.Extended/tests/MonoGame.Extended.Entities.Tests/WorldManagerTests.cs b/Plugins/MonoGame.Extended/tests/MonoGame.Extended.Entities.Tests/WorldManagerTests.cs
new file mode 100644
index 0000000..7620f1e
--- /dev/null
+++ b/Plugins/MonoGame.Extended/tests/MonoGame.Extended.Entities.Tests/WorldManagerTests.cs
@@ -0,0 +1,71 @@
+using System;
+using System.Collections.Generic;
+using Microsoft.Xna.Framework;
+using MonoGame.Extended.Entities.Systems;
+using MonoGame.Extended.Sprites;
+using Xunit;
+
+namespace MonoGame.Extended.Entities.Tests;
+
+public class WorldManagerTests
+{
+    private GameTime _gameTime = new GameTime(TimeSpan.Zero, TimeSpan.FromMilliseconds(16));
+
+    [Fact]
+    public void CrudEntity()
+    {
+        var dummySystem = new DummySystem();
+        var worldBuilder = new WorldBuilder();
+        worldBuilder.AddSystem(dummySystem);
+        var world = worldBuilder.Build();
+
+        world.Initialize();
+
+        var entity = world.CreateEntity();
+        entity.Attach(new Transform2());
+        world.Update(_gameTime);
+        world.Draw(_gameTime);
+        var otherEntity = world.GetEntity(entity.Id);
+        Assert.Equal(entity, otherEntity);
+        Assert.True(otherEntity.Has<Transform2>());
+        Assert.Contains(entity.Id, dummySystem.AddedEntitiesId);
+
+        entity.Destroy();
+        world.Update(_gameTime);
+        world.Draw(_gameTime);
+        otherEntity = world.GetEntity(entity.Id);
+        Assert.Null(otherEntity);
+        Assert.Contains(entity.Id, dummySystem.RemovedEntitiesId);
+    }
+
+    private class DummyComponent { }
+
+    private class DummySystem : EntitySystem, IUpdateSystem, IDrawSystem
+    {
+        public List<int> AddedEntitiesId { get; } = new ();
+        public List<int> RemovedEntitiesId { get; } = new ();
+
+        public DummySystem() : base(Aspect.All(typeof(DummyComponent))) { }
+
+        public override void Initialize(IComponentMapperService mapperService)
+        {
+            // Do NOT initialize mapper in  order to test: https://github.com/craftworkgames/MonoGame.Extended/issues/707
+        }
+
+        public void Draw(GameTime gameTime) { }
+
+        public void Update(GameTime gameTime) { }
+
+        protected override void OnEntityAdded(int entityId)
+        {
+            base.OnEntityAdded(entityId);
+            AddedEntitiesId.Add(entityId);
+        }
+
+        protected override void OnEntityRemoved(int entityId)
+        {
+            base.OnEntityRemoved(entityId);
+            RemovedEntitiesId.Add(entityId);
+        }
+    }
+}