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tests/reachability/StellaOps.Replay.Core.Tests/DeterministicHashTests.cs

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+using System.Text;
+using FluentAssertions;
+using StellaOps.Replay.Core;
+using Xunit;
+
+namespace StellaOps.Replay.Core.Tests;
+
+public sealed class DeterministicHashTests
+{
+    [Fact]
+    public void Sha256Hex_ComputesLowercaseDigest()
+    {
+        var digest = DeterministicHash.Sha256Hex("replay-core");
+
+        digest.Should().Be("a914f5ac6a57aab0189bb55bcb0ef6bcdbd86f77198c8669eab5ae38a325e41d");
+    }
+
+    [Fact]
+    public void MerkleRootHex_IsDeterministic()
+    {
+        var leaves = new[] { "alpha", "beta", "gamma" }
+            .Select(Encoding.UTF8.GetBytes)
+            .ToList();
+
+        var root = DeterministicHash.MerkleRootHex(leaves);
+
+        root.Should().Be("50298939464ed02cbf2b587250a55746b3422e133ac4f09b7e2b07869023bc9e");
+        DeterministicHash.MerkleRootHex(leaves).Should().Be(root);
+    }
+}