initial commit

tests/TraceCad.Tests/SerializationTests.cs

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+using TraceCad.Core.Geometry;
+using TraceCad.Core.Model;
+using TraceCad.Core.Serialization;
+using Xunit;
+
+namespace TraceCad.Tests;
+
+public sealed class SerializationTests
+{
+    [Fact]
+    public void SketchDocumentRoundTripsEntitiesAndLayers()
+    {
+        var document = SketchDocument.CreateDefault();
+        var lineId = Guid.NewGuid();
+        var circleId = Guid.NewGuid();
+        var arcId = Guid.NewGuid();
+
+        document.AddEntity(new LineEntity(lineId, Layer.Cut.Name, new Point2(10, 20), new Point2(40, 50)));
+        document.AddEntity(new CircleEntity(circleId, Layer.Cut.Name, new Point2(15, 15), 8));
+        document.AddEntity(new ArcEntity(arcId, Layer.Cut.Name, new Point2(0, 0), 12, 0, 90, false));
+
+        var json = SketchDocumentSerializer.Serialize(document);
+        var reloaded = SketchDocumentSerializer.Deserialize(json);
+
+        Assert.Equal("mm", reloaded.Units);
+        Assert.Equal(document.Layers.Count, reloaded.Layers.Count);
+        Assert.Contains(reloaded.Entities, entity => entity.Id == lineId);
+        Assert.Contains(reloaded.Entities, entity => entity.Id == circleId);
+        Assert.Contains(reloaded.Entities, entity => entity.Id == arcId);
+    }
+
+    [Fact]
+    public void SketchDocumentRoundTripsReferenceImage()
+    {
+        var document = SketchDocument.CreateDefault();
+        document.Reference = new ReferenceImage(
+            "reference.png",
+            0.42,
+            Locked: false,
+            new ReferenceTransform(12.5, 20.0, 0.25, 0.25, 8.0));
+
+        var json = SketchDocumentSerializer.Serialize(document);
+        var reloaded = SketchDocumentSerializer.Deserialize(json);
+
+        Assert.NotNull(reloaded.Reference);
+        Assert.Equal("reference.png", reloaded.Reference.ImagePath);
+        Assert.Equal(0.42, reloaded.Reference.Opacity, 9);
+        Assert.False(reloaded.Reference.Locked);
+        Assert.Equal(12.5, reloaded.Reference.Transform.OriginX, 9);
+        Assert.Equal(0.25, reloaded.Reference.Transform.ScaleX, 9);
+        Assert.Equal(8.0, reloaded.Reference.Transform.RotationDeg, 9);
+    }
+}