Add InverterNode

src/InverterNode.cs

@@ -0,0 +1,26 @@
+namespace AivoTree
+{
+    public class InverterNode<T> : TreeNode<T>
+    {
+        private readonly TreeNode<T> node;
+
+        public InverterNode(TreeNode<T> node)
+        {
+            this.node = node;
+        }
+
+        public AivoTreeStatus Tick(long timeTick, T context)
+        {
+            var status = node.Tick(timeTick, context);
+            switch (status)
+            {
+                case AivoTreeStatus.Success:
+                    return AivoTreeStatus.Failure;
+                case AivoTreeStatus.Failure:
+                    return AivoTreeStatus.Success;
+                default:
+                    return status;
+            }
+        }
+    }
+}

src/aivo.csproj

@@ -36,6 +36,7 @@
   <ItemGroup>
     <Compile Include="ActionNode.cs" />
     <Compile Include="AivoTreeStatus.cs" />
+    <Compile Include="InverterNode.cs" />
     <Compile Include="SelectorNode.cs" />
     <Compile Include="SequenceNode.cs" />
     <Compile Include="TreeNode.cs" />

test/Tests.cs

@@ -68,6 +68,14 @@ public void SelectorNodeContinuesWithCurrentlyRunningNodeWithNextTick()
             Assert.AreEqual(AivoTreeStatus.Running, sequence.Tick(1, model));
             Assert.AreEqual(AivoTreeStatus.Success, sequence.Tick(2, model));
         }
+
+        [Test]
+        public void InverterNodeInvertsFailSuccessStateTheResul()
+        {
+            Assert.AreEqual(AivoTreeStatus.Success, new InverterNode<MyModel>(new FailingNode()).Tick(1, new MyModel()));
+            Assert.AreEqual(AivoTreeStatus.Failure, new InverterNode<MyModel>(new SucceedingNode()).Tick(1, new MyModel()));
+            Assert.AreEqual(AivoTreeStatus.Running, new InverterNode<MyModel>(new RunOnceAndSucceedNextNode()).Tick(1, new MyModel()));
+        }
     }
 
     public class MyModel