add unit test and finish operator test

BallanceTASEditor/UI/OperationEnum.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BallanceTASEditor.UI {
+    public enum OperationEnum {
+        Set,
+        Unset,
+        Copy,
+        PasteAfter,
+        PasteBefore,
+        Delete,
+        DeleteAfter,
+        DeleteBefore,
+        AddAfter,
+        AddBefore,
+        Undo,
+        Redo
+    }
+}