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src/StellaOps.Vexer.Export.Tests/ExportEngineTests.cs

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+using System;
+using System.Collections.Immutable;
+using System.IO;
+using System.Text;
+using Microsoft.Extensions.Logging.Abstractions;
+using StellaOps.Vexer.Core;
+using StellaOps.Vexer.Export;
+using StellaOps.Vexer.Policy;
+using StellaOps.Vexer.Storage.Mongo;
+using Xunit;
+
+namespace StellaOps.Vexer.Export.Tests;
+
+public sealed class ExportEngineTests
+{
+    [Fact]
+    public async Task ExportAsync_GeneratesAndCachesManifest()
+    {
+        var store = new InMemoryExportStore();
+        var evaluator = new StaticPolicyEvaluator("baseline/v1");
+        var dataSource = new InMemoryExportDataSource();
+        var exporter = new DummyExporter(VexExportFormat.Json);
+        var engine = new VexExportEngine(store, evaluator, dataSource, new[] { exporter }, NullLogger<VexExportEngine>.Instance);
+
+        var query = VexQuery.Create(new[] { new VexQueryFilter("vulnId", "CVE-2025-0001") });
+        var context = new VexExportRequestContext(query, VexExportFormat.Json, DateTimeOffset.UtcNow, ForceRefresh: false);
+
+        var manifest = await engine.ExportAsync(context, CancellationToken.None);
+
+        Assert.False(manifest.FromCache);
+        Assert.Equal(VexExportFormat.Json, manifest.Format);
+        Assert.Equal("baseline/v1", manifest.ConsensusRevision);
+        Assert.Equal(1, manifest.ClaimCount);
+
+        // second call hits cache
+        var cached = await engine.ExportAsync(context, CancellationToken.None);
+        Assert.True(cached.FromCache);
+        Assert.Equal(manifest.ExportId, cached.ExportId);
+    }
+
+    private sealed class InMemoryExportStore : IVexExportStore
+    {
+        private readonly Dictionary<string, VexExportManifest> _store = new(StringComparer.Ordinal);
+
+        public ValueTask<VexExportManifest?> FindAsync(VexQuerySignature signature, VexExportFormat format, CancellationToken cancellationToken)
+        {
+            var key = CreateKey(signature.Value, format);
+            _store.TryGetValue(key, out var manifest);
+            return ValueTask.FromResult<VexExportManifest?>(manifest);
+        }
+
+        public ValueTask SaveAsync(VexExportManifest manifest, CancellationToken cancellationToken)
+        {
+            var key = CreateKey(manifest.QuerySignature.Value, manifest.Format);
+            _store[key] = manifest;
+            return ValueTask.CompletedTask;
+        }
+
+        private static string CreateKey(string signature, VexExportFormat format)
+            => FormattableString.Invariant($"{signature}|{format}");
+    }
+
+    private sealed class StaticPolicyEvaluator : IVexPolicyEvaluator
+    {
+        public StaticPolicyEvaluator(string version)
+        {
+            Version = version;
+        }
+
+        public string Version { get; }
+
+        public VexPolicySnapshot Snapshot => VexPolicySnapshot.Default;
+
+        public double GetProviderWeight(VexProvider provider) => 1.0;
+
+        public bool IsClaimEligible(VexClaim claim, VexProvider provider, out string? rejectionReason)
+        {
+            rejectionReason = null;
+            return true;
+        }
+    }
+
+    private sealed class InMemoryExportDataSource : IVexExportDataSource
+    {
+        public ValueTask<VexExportDataSet> FetchAsync(VexQuery query, CancellationToken cancellationToken)
+        {
+            var claim = new VexClaim(
+                "CVE-2025-0001",
+                "vendor",
+                new VexProduct("pkg:demo/app", "Demo"),
+                VexClaimStatus.Affected,
+                new VexClaimDocument(VexDocumentFormat.Csaf, "sha256:demo", new Uri("https://example.org/demo")),
+                DateTimeOffset.UtcNow,
+                DateTimeOffset.UtcNow);
+
+            var consensus = new VexConsensus(
+                "CVE-2025-0001",
+                claim.Product,
+                VexConsensusStatus.Affected,
+                DateTimeOffset.UtcNow,
+                new[] { new VexConsensusSource("vendor", VexClaimStatus.Affected, "sha256:demo", 1.0) },
+                conflicts: null,
+                policyVersion: "baseline/v1",
+                summary: "affected");
+
+            return ValueTask.FromResult(new VexExportDataSet(
+                ImmutableArray.Create(consensus),
+                ImmutableArray.Create(claim),
+                ImmutableArray.Create("vendor")));
+        }
+    }
+
+    private sealed class DummyExporter : IVexExporter
+    {
+        public DummyExporter(VexExportFormat format)
+        {
+            Format = format;
+        }
+
+        public VexExportFormat Format { get; }
+
+        public VexContentAddress Digest(VexExportRequest request)
+            => new("sha256", "deadbeef");
+
+        public ValueTask<VexExportResult> SerializeAsync(VexExportRequest request, Stream output, CancellationToken cancellationToken)
+        {
+            var bytes = System.Text.Encoding.UTF8.GetBytes("{}");
+            output.Write(bytes);
+            return ValueTask.FromResult(new VexExportResult(new VexContentAddress("sha256", "deadbeef"), bytes.Length, ImmutableDictionary<string, string>.Empty));
+        }
+    }
+}

src/StellaOps.Vexer.Export.Tests/StellaOps.Vexer.Export.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <LangVersion>preview</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\StellaOps.Vexer.Export\StellaOps.Vexer.Export.csproj" />
+  </ItemGroup>
+</Project>