added base helpers and a simple test.

GodotHelper.Tests/test/src/MyNodeExtensionsTest.cs

@@ -0,0 +1,34 @@
+namespace GodotHelper.Tests;
+
+using System;
+using System.Threading.Tasks;
+using Chickensoft.GoDotTest;
+using Godot;
+using GodotHelpers;
+using Shouldly;
+
+public class MyNodeExtensionsTest : TestClass
+{
+  public MyNodeExtensionsTest(Node testScene) : base(testScene) { }
+
+  [Test]
+  public async Task FreeDeferred()
+  {
+    var test = new Node();
+    var freeDeferred = new Node();
+    TestScene.AddChild(test);
+    test.AddChild(freeDeferred);
+    var tree = TestScene.GetTree();
+    await tree.ToSignal(tree, SceneTree.SignalName.ProcessFrame);
+
+    // Console.Write(test.GetChildCount());
+    freeDeferred.FreeDeferred();
+
+    test.GetChildCount().ShouldBe(1);
+
+    await tree.ToSignal(tree, SceneTree.SignalName.ProcessFrame);
+    test.GetChildCount().ShouldBe(0);
+
+  }
+
+}