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

tests/unit/StellaOps.AuditPack.Tests/AuditPackBuilderTests.cs

@@ -0,0 +1,77 @@
+namespace StellaOps.AuditPack.Tests;
+
+using StellaOps.AuditPack.Models;
+using StellaOps.AuditPack.Services;
+
+[Trait("Category", "Unit")]
+public class AuditPackBuilderTests
+{
+    [Fact]
+    public async Task Build_FromScanResult_CreatesCompletePack()
+    {
+        // Arrange
+        var scanResult = new ScanResult("scan-123");
+        var builder = new AuditPackBuilder();
+        var options = new AuditPackOptions { Name = "test-pack" };
+
+        // Act
+        var pack = await builder.BuildAsync(scanResult, options);
+
+        // Assert
+        pack.Should().NotBeNull();
+        pack.PackId.Should().NotBeNullOrEmpty();
+        pack.Name.Should().Be("test-pack");
+        pack.RunManifest.Should().NotBeNull();
+        pack.Verdict.Should().NotBeNull();
+        pack.EvidenceIndex.Should().NotBeNull();
+        pack.PackDigest.Should().NotBeNullOrEmpty();
+    }
+
+    [Fact]
+    public async Task Export_CreatesValidArchive()
+    {
+        // Arrange
+        var scanResult = new ScanResult("scan-123");
+        var builder = new AuditPackBuilder();
+        var pack = await builder.BuildAsync(scanResult, new AuditPackOptions());
+
+        var outputPath = Path.Combine(Path.GetTempPath(), $"test-pack-{Guid.NewGuid():N}.tar.gz");
+        var exportOptions = new ExportOptions { Sign = false };
+
+        try
+        {
+            // Act
+            await builder.ExportAsync(pack, outputPath, exportOptions);
+
+            // Assert
+            File.Exists(outputPath).Should().BeTrue();
+            var fileInfo = new FileInfo(outputPath);
+            fileInfo.Length.Should().BeGreaterThan(0);
+        }
+        finally
+        {
+            if (File.Exists(outputPath))
+                File.Delete(outputPath);
+        }
+    }
+
+    [Fact]
+    public void PackDigest_IsComputedCorrectly()
+    {
+        // Arrange
+        var pack = new AuditPack
+        {
+            PackId = "test-pack",
+            Name = "Test Pack",
+            CreatedAt = new DateTimeOffset(2025, 1, 1, 0, 0, 0, TimeSpan.Zero),
+            RunManifest = new RunManifest("scan-1", DateTimeOffset.UtcNow),
+            EvidenceIndex = new EvidenceIndex([]),
+            Verdict = new Verdict("verdict-1", "pass"),
+            OfflineBundle = new BundleManifest("bundle-1", "1.0"),
+            Contents = new PackContents()
+        };
+
+        // Act - digest should be set during build
+        pack.PackDigest.Should().NotBeNull();
+    }
+}