Refactor code structure for improved readability and maintainability; optimize performance in key functions.

src/Scanner/__Tests/StellaOps.Scanner.Emit.Tests/Composition/SpdxCycloneDxConversionTests.cs

@@ -0,0 +1,76 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using CycloneDX.Models;
+using StellaOps.Scanner.Emit.Spdx.Conversion;
+using Xunit;
+
+namespace StellaOps.Scanner.Emit.Tests.Composition;
+
+public sealed class SpdxCycloneDxConversionTests
+{
+    [Fact]
+    public void Converts_CycloneDx_To_Spdx()
+    {
+        var bom = BuildBom();
+
+        var spdx = SpdxCycloneDxConverter.FromCycloneDx(bom);
+
+        var packages = spdx.Elements.OfType<StellaOps.Scanner.Emit.Spdx.Models.SpdxPackage>().ToArray();
+        Assert.Equal(2, packages.Length);
+        Assert.Contains(packages, pkg => pkg.Name == "demo-app");
+        Assert.Contains(spdx.Relationships, rel => rel.Type == StellaOps.Scanner.Emit.Spdx.Models.SpdxRelationshipType.DependsOn);
+    }
+
+    [Fact]
+    public void Converts_Spdx_To_CycloneDx()
+    {
+        var bom = BuildBom();
+        var spdx = SpdxCycloneDxConverter.FromCycloneDx(bom);
+
+        var converted = SpdxCycloneDxConverter.ToCycloneDx(spdx);
+
+        Assert.NotNull(converted.Metadata);
+        Assert.NotNull(converted.Components);
+        Assert.Contains(converted.Components!, component => component.Name == "dependency");
+    }
+
+    private static Bom BuildBom()
+    {
+        var root = new Component
+        {
+            BomRef = "root",
+            Name = "demo-app",
+            Version = "1.0.0",
+            Type = Component.Classification.Application
+        };
+
+        var dependency = new Component
+        {
+            BomRef = "dep",
+            Name = "dependency",
+            Version = "2.0.0",
+            Type = Component.Classification.Library
+        };
+
+        return new Bom
+        {
+            SpecVersion = SpecificationVersion.v1_7,
+            Version = 1,
+            Metadata = new Metadata
+            {
+                Timestamp = new DateTime(2025, 10, 20, 0, 0, 0, DateTimeKind.Utc),
+                Component = root
+            },
+            Components = new List<Component> { dependency },
+            Dependencies = new List<Dependency>
+            {
+                new()
+                {
+                    Ref = root.BomRef,
+                    Dependencies = new List<Dependency> { new() { Ref = dependency.BomRef } }
+                }
+            }
+        };
+    }
+}