refactor(engine): extract PairFiller from DefaultNestEngine

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-16 22:31:51 -04:00
parent 14048b0b7c
commit c8587929b5
3 changed files with 190 additions and 1 deletions
@@ -0,0 +1,63 @@
+using OpenNest.Geometry;
+
+namespace OpenNest.Tests;
+
+public class PairFillerTests
+{
+    private static Drawing MakeRectDrawing(double w, double h)
+    {
+        var pgm = new OpenNest.CNC.Program();
+        pgm.Codes.Add(new OpenNest.CNC.RapidMove(new Vector(0, 0)));
+        pgm.Codes.Add(new OpenNest.CNC.LinearMove(new Vector(w, 0)));
+        pgm.Codes.Add(new OpenNest.CNC.LinearMove(new Vector(w, h)));
+        pgm.Codes.Add(new OpenNest.CNC.LinearMove(new Vector(0, h)));
+        pgm.Codes.Add(new OpenNest.CNC.LinearMove(new Vector(0, 0)));
+        return new Drawing("rect", pgm);
+    }
+
+    [Fact]
+    public void Fill_ReturnsPartsForSimpleDrawing()
+    {
+        var plateSize = new Size(120, 60);
+        var filler = new PairFiller(plateSize, 0.5);
+        var item = new NestItem { Drawing = MakeRectDrawing(20, 10) };
+        var workArea = new Box(0, 0, 120, 60);
+
+        var parts = filler.Fill(item, workArea);
+
+        Assert.NotNull(parts);
+        // Pair filling may or may not find interlocking pairs for rectangles,
+        // but should return a non-null list.
+    }
+
+    [Fact]
+    public void Fill_EmptyResult_WhenPartTooLarge()
+    {
+        var plateSize = new Size(10, 10);
+        var filler = new PairFiller(plateSize, 0.5);
+        var item = new NestItem { Drawing = MakeRectDrawing(20, 20) };
+        var workArea = new Box(0, 0, 10, 10);
+
+        var parts = filler.Fill(item, workArea);
+
+        Assert.NotNull(parts);
+        Assert.Empty(parts);
+    }
+
+    [Fact]
+    public void Fill_RespectsCancellation()
+    {
+        var cts = new System.Threading.CancellationTokenSource();
+        cts.Cancel();
+
+        var plateSize = new Size(120, 60);
+        var filler = new PairFiller(plateSize, 0.5);
+        var item = new NestItem { Drawing = MakeRectDrawing(20, 10) };
+        var workArea = new Box(0, 0, 120, 60);
+
+        var parts = filler.Fill(item, workArea, token: cts.Token);
+
+        // Should return empty or partial — not throw
+        Assert.NotNull(parts);
+    }
+}