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src/Policy/__Tests/StellaOps.Policy.Engine.Tests/Console/ConsoleSimulationDiffServiceTests.cs

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+using System;
+using StellaOps.Policy.Engine.ConsoleSurface;
+using StellaOps.Policy.Engine.Simulation;
+using Xunit;
+
+namespace StellaOps.Policy.Engine.Tests.ConsoleSurface;
+
+public sealed class ConsoleSimulationDiffServiceTests
+{
+    [Fact]
+    public void Compute_IsDeterministic_AndCarriesMetadata()
+    {
+        var analytics = new SimulationAnalyticsService();
+        var service = new ConsoleSimulationDiffService(analytics);
+
+        var request = new ConsoleSimulationDiffRequest(
+            BaselinePolicyVersion: "2025.11.24",
+            CandidatePolicyVersion: "2025.12.02",
+            ArtifactScope: new[]
+            {
+                new ConsoleArtifactScope("sha256:abc", "pkg:npm/foo@1.0.0"),
+                new ConsoleArtifactScope("sha256:def", "pkg:npm/bar@2.0.0")
+            },
+            Filters: new ConsoleSimulationFilters(new[] { "high", "critical" }, new[] { "RULE-1234" }),
+            Budget: new ConsoleSimulationBudget(maxFindings: 10, maxExplainSamples: 5),
+            EvaluationTimestamp: new DateTimeOffset(2025, 12, 2, 0, 0, 0, TimeSpan.Zero));
+
+        var first = service.Compute(request);
+        var second = service.Compute(request);
+
+        Assert.Equal(first, second); // deterministic
+        Assert.Equal("console-policy-23-001", first.SchemaVersion);
+        Assert.True(first.Summary.After.Total > 0);
+        Assert.True(first.Summary.Before.Total > 0);
+        Assert.NotEmpty(first.RuleImpact);
+        Assert.True(first.Samples.Findings.Length <= 10);
+        Assert.Equal(request.EvaluationTimestamp, first.Provenance.EvaluationTimestamp);
+    }
+}