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src/Signals/__Tests/StellaOps.Signals.Tests/ReachabilityFactDigestCalculatorTests.cs

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+using System;
+using System.Collections.Generic;
+using StellaOps.Signals.Models;
+using StellaOps.Signals.Services;
+using Xunit;
+
+public class ReachabilityFactDigestCalculatorTests
+{
+    [Fact]
+    public void Compute_ReturnsDeterministicDigest_ForEquivalentFacts()
+    {
+        var factA = new ReachabilityFactDocument
+        {
+            CallgraphId = "cg-1",
+            Subject = new ReachabilitySubject { Component = "demo", Version = "1.0.0" },
+            SubjectKey = "demo|1.0.0",
+            EntryPoints = new List<string> { "svc.main", "app.main" },
+            States = new List<ReachabilityStateDocument>
+            {
+                new() { Target = "a", Reachable = true, Confidence = 0.9, Bucket = "runtime", Weight = 0.45, Path = new List<string> { "app.main", "a" }, Evidence = new ReachabilityEvidenceDocument { RuntimeHits = new List<string> { "a" } } },
+                new() { Target = "b", Reachable = false, Confidence = 0.3, Bucket = "unreachable", Weight = 0.1, Path = new List<string> { "app.main", "b" } }
+            },
+            RuntimeFacts = new List<RuntimeFactDocument>
+            {
+                new() { SymbolId = "a", HitCount = 2 }
+            },
+            Metadata = new Dictionary<string, string?>(StringComparer.Ordinal) { { "tenant", "tenant-default" } },
+            ComputedAt = DateTimeOffset.Parse("2025-12-09T00:00:00Z")
+        };
+
+        var factB = new ReachabilityFactDocument
+        {
+            CallgraphId = "cg-1",
+            Subject = new ReachabilitySubject { Component = "demo", Version = "1.0.0" },
+            SubjectKey = "demo|1.0.0",
+            EntryPoints = new List<string> { "app.main", "svc.main" }, // reversed
+            States = new List<ReachabilityStateDocument>
+            {
+                new() { Target = "b", Reachable = false, Confidence = 0.3, Bucket = "unreachable", Weight = 0.1, Path = new List<string> { "app.main", "b" } },
+                new() { Target = "a", Reachable = true, Confidence = 0.9, Bucket = "runtime", Weight = 0.45, Path = new List<string> { "app.main", "a" }, Evidence = new ReachabilityEvidenceDocument { RuntimeHits = new List<string> { "a" } } }
+            },
+            RuntimeFacts = new List<RuntimeFactDocument>
+            {
+                new() { SymbolId = "a", HitCount = 2 }
+            },
+            Metadata = new Dictionary<string, string?>(StringComparer.Ordinal) { { "tenant", "tenant-default" } },
+            ComputedAt = DateTimeOffset.Parse("2025-12-09T00:00:00Z")
+        };
+
+        var digestA = ReachabilityFactDigestCalculator.Compute(factA);
+        var digestB = ReachabilityFactDigestCalculator.Compute(factB);
+
+        Assert.StartsWith("sha256:", digestA, StringComparison.Ordinal);
+        Assert.Equal(digestA, digestB);
+    }
+}