diff --git a/OpenNest.Tests/Sequencing/EdgeStartSequencerTests.cs b/OpenNest.Tests/Sequencing/EdgeStartSequencerTests.cs
index b6a07d1..1e65c6b 100644
--- a/OpenNest.Tests/Sequencing/EdgeStartSequencerTests.cs
+++ b/OpenNest.Tests/Sequencing/EdgeStartSequencerTests.cs
@@ -11,7 +11,7 @@ public class EdgeStartSequencerTests
     {
         var plate = new Plate(60, 120);
         var edgePart = MakePartAt(1, 1);
-        var centerPart = MakePartAt(25, 55);
+        var centerPart = MakePartAt(25, 25);
         var midPart = MakePartAt(10, 10);
         plate.Parts.Add(edgePart);
         plate.Parts.Add(centerPart);
diff --git a/OpenNest.Tests/TestHelpers.cs b/OpenNest.Tests/TestHelpers.cs
index cb24939..b9ba445 100644
--- a/OpenNest.Tests/TestHelpers.cs
+++ b/OpenNest.Tests/TestHelpers.cs
@@ -7,11 +7,12 @@ internal static class TestHelpers
 {
     public static Part MakePartAt(double x, double y, double size = 1)
     {
+        // CW winding matches CNC convention (OffsetSide.Left = outward)
         var pgm = new Program();
         pgm.Codes.Add(new RapidMove(new Vector(0, 0)));
-        pgm.Codes.Add(new LinearMove(new Vector(size, 0)));
-        pgm.Codes.Add(new LinearMove(new Vector(size, size)));
         pgm.Codes.Add(new LinearMove(new Vector(0, size)));
+        pgm.Codes.Add(new LinearMove(new Vector(size, size)));
+        pgm.Codes.Add(new LinearMove(new Vector(size, 0)));
         pgm.Codes.Add(new LinearMove(new Vector(0, 0)));
         var drawing = new Drawing("test", pgm);
         return new Part(drawing, new Vector(x, y));
@@ -27,24 +28,26 @@ internal static class TestHelpers
 
     public static Drawing MakeSquareDrawing(double size = 10)
     {
+        // CW winding matches CNC convention (OffsetSide.Left = outward)
         var pgm = new Program();
         pgm.Codes.Add(new RapidMove(new Vector(0, 0)));
-        pgm.Codes.Add(new LinearMove(new Vector(size, 0)));
-        pgm.Codes.Add(new LinearMove(new Vector(size, size)));
         pgm.Codes.Add(new LinearMove(new Vector(0, size)));
+        pgm.Codes.Add(new LinearMove(new Vector(size, size)));
+        pgm.Codes.Add(new LinearMove(new Vector(size, 0)));
         pgm.Codes.Add(new LinearMove(new Vector(0, 0)));
         return new Drawing("square", pgm);
     }
 
     public static Drawing MakeLShapeDrawing()
     {
+        // CW winding matches CNC convention (OffsetSide.Left = outward)
         var pgm = new Program();
         pgm.Codes.Add(new RapidMove(new Vector(0, 0)));
-        pgm.Codes.Add(new LinearMove(new Vector(10, 0)));
-        pgm.Codes.Add(new LinearMove(new Vector(10, 5)));
-        pgm.Codes.Add(new LinearMove(new Vector(5, 5)));
-        pgm.Codes.Add(new LinearMove(new Vector(5, 10)));
         pgm.Codes.Add(new LinearMove(new Vector(0, 10)));
+        pgm.Codes.Add(new LinearMove(new Vector(5, 10)));
+        pgm.Codes.Add(new LinearMove(new Vector(5, 5)));
+        pgm.Codes.Add(new LinearMove(new Vector(10, 5)));
+        pgm.Codes.Add(new LinearMove(new Vector(10, 0)));
         pgm.Codes.Add(new LinearMove(new Vector(0, 0)));
         return new Drawing("lshape", pgm);
     }