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src/Policy/__Tests/StellaOps.Policy.Engine.Tests/SnapshotServiceTests.cs

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+using Microsoft.Extensions.Time.Testing;
+using StellaOps.Policy.Engine.Ledger;
+using StellaOps.Policy.Engine.Orchestration;
+using StellaOps.Policy.Engine.Snapshots;
+
+namespace StellaOps.Policy.Engine.Tests;
+
+public sealed class SnapshotServiceTests
+{
+    [Fact]
+    public async Task CreateAsync_ProducesSnapshotFromLedger()
+    {
+        var clock = new FakeTimeProvider(DateTimeOffset.Parse("2025-11-24T16:00:00Z"));
+        var jobStore = new InMemoryOrchestratorJobStore();
+        var resultStore = new InMemoryWorkerResultStore(jobStore);
+        var exportStore = new InMemoryLedgerExportStore();
+        var ledger = new LedgerExportService(clock, jobStore, resultStore, exportStore);
+        var snapshotStore = new InMemorySnapshotStore();
+        var service = new SnapshotService(clock, ledger, snapshotStore);
+
+        var job = new OrchestratorJob(
+            JobId: "job-xyz",
+            TenantId: "acme",
+            ContextId: "ctx",
+            PolicyProfileHash: "hash",
+            RequestedAt: clock.GetUtcNow(),
+            Priority: "normal",
+            BatchItems: new[] { new OrchestratorJobItem("pkg:a", "ADV-1") },
+            Callbacks: null,
+            TraceRef: "trace",
+            Status: "completed",
+            DeterminismHash: "hash",
+            CompletedAt: clock.GetUtcNow(),
+            ResultHash: "res");
+
+        await jobStore.SaveAsync(job);
+        await resultStore.SaveAsync(new WorkerRunResult(
+            job.JobId,
+            "worker",
+            clock.GetUtcNow(),
+            clock.GetUtcNow(),
+            new[] { new WorkerResultItem("pkg:a", "ADV-1", "violation", "trace-ref") },
+            "hash"));
+
+        await ledger.BuildAsync(new LedgerExportRequest("acme"));
+
+        var snapshot = await service.CreateAsync(new SnapshotRequest("acme", "overlay-1"));
+
+        Assert.Equal("acme", snapshot.TenantId);
+        Assert.Equal("overlay-1", snapshot.OverlayHash);
+        Assert.Single(snapshot.Records);
+        Assert.Contains("violation", snapshot.StatusCounts.Keys);
+
+        var list = await service.ListAsync("acme");
+        Assert.Single(list.Items);
+    }
+}