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

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+using System.Threading.Tasks;
+using StellaOps.Policy.Engine.Overlay;
+using StellaOps.Policy.Engine.Services;
+using StellaOps.Policy.Engine.Streaming;
+
+namespace StellaOps.Policy.Engine.Tests;
+
+public sealed class OverlayProjectionServiceTests
+{
+    [Fact]
+    public async Task BuildSnapshotAsync_ProducesHeaderAndSortedProjections()
+    {
+        var service = new OverlayProjectionService(new PolicyEvaluationService(), TimeProvider.System);
+
+        var request = new PathScopeSimulationRequest(
+            SchemaVersion: "1.0.0",
+            Tenant: "acme",
+            BasePolicyRef: "policy://acme/main@sha256:1",
+            CandidatePolicyRef: "policy://acme/feat@sha256:2",
+            Subject: new PathScopeSubject("pkg:npm/lodash@4.17.21", null, "lib.js", null),
+            Targets: new[]
+            {
+                new PathScopeTarget("b/file.js", "b/", "prefix", 0.5, null, null, null, "e2", null, null),
+                new PathScopeTarget("a/file.js", "a/", "prefix", 0.9, null, null, null, "e1", null, null)
+            },
+            Options: new SimulationOptions("path,finding,verdict", 100, IncludeTrace: true, Deterministic: true));
+
+        var lines = await service.BuildSnapshotAsync(request);
+
+        Assert.Equal(3, lines.Count); // header + 2 projections
+        Assert.Contains("overlay-projection-v1", lines[0]);
+        Assert.Contains("\"filePath\":\"a/file.js\"", lines[1]);
+        Assert.Contains("\"filePath\":\"b/file.js\"", lines[2]);
+    }
+}