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

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+using Microsoft.Extensions.Time.Testing;
+using StellaOps.Policy.Engine.Orchestration;
+
+namespace StellaOps.Policy.Engine.Tests;
+
+public sealed class PolicyWorkerServiceTests
+{
+    [Fact]
+    public async Task ExecuteAsync_ReturnsDeterministicResults()
+    {
+        var clock = new FakeTimeProvider(DateTimeOffset.Parse("2025-11-24T13:00:00Z"));
+        var jobStore = new InMemoryOrchestratorJobStore();
+        var resultStore = new InMemoryWorkerResultStore(jobStore);
+        var service = new PolicyWorkerService(clock, jobStore, resultStore);
+
+        var job = new OrchestratorJob(
+            JobId: "01HZX1QJP6Z3MNA0Q2T3VCPV5K",
+            TenantId: "tenant",
+            ContextId: "ctx",
+            PolicyProfileHash: "hash",
+            RequestedAt: clock.GetUtcNow(),
+            Priority: "normal",
+            BatchItems: new[]
+            {
+                new OrchestratorJobItem("pkg:npm/alpha@1.0.0", "ADV-1"),
+                new OrchestratorJobItem("pkg:npm/zeta@1.0.0", "ADV-2")
+            },
+            Callbacks: null,
+            TraceRef: "trace",
+            Status: "queued",
+            DeterminismHash: "hash-determinism");
+
+        await jobStore.SaveAsync(job);
+
+        var result = await service.ExecuteAsync(new WorkerRunRequest(job.JobId), CancellationToken.None);
+
+        Assert.Equal(job.JobId, result.JobId);
+        Assert.Equal("worker-stub", result.WorkerId);
+        Assert.Equal(2, result.Results.Count);
+        Assert.True(result.Results.All(r => !string.IsNullOrWhiteSpace(r.Status)));
+
+        var fetched = await resultStore.GetByJobIdAsync(job.JobId);
+        Assert.NotNull(fetched);
+        Assert.Equal(result.ResultHash, fetched!.ResultHash);
+    }
+
+    [Fact]
+    public async Task ExecuteAsync_IsIdempotentOnRetry()
+    {
+        var clock = new FakeTimeProvider(DateTimeOffset.Parse("2025-11-24T14:00:00Z"));
+        var jobStore = new InMemoryOrchestratorJobStore();
+        var resultStore = new InMemoryWorkerResultStore(jobStore);
+        var service = new PolicyWorkerService(clock, jobStore, resultStore);
+
+        var job = new OrchestratorJob(
+            JobId: "job-id",
+            TenantId: "tenant",
+            ContextId: "ctx",
+            PolicyProfileHash: "hash",
+            RequestedAt: clock.GetUtcNow(),
+            Priority: "normal",
+            BatchItems: new[] { new OrchestratorJobItem("pkg:a", "ADV-1") },
+            Callbacks: null,
+            TraceRef: "trace",
+            Status: "queued",
+            DeterminismHash: "hash");
+
+        await jobStore.SaveAsync(job);
+
+        var first = await service.ExecuteAsync(new WorkerRunRequest(job.JobId));
+        var second = await service.ExecuteAsync(new WorkerRunRequest(job.JobId));
+
+        Assert.Equal(first.ResultHash, second.ResultHash);
+        Assert.Equal(first.CompletedAt, second.CompletedAt);
+    }
+}