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

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+using System.Text.Json;
+using FluentAssertions;
+using StellaOps.Replay.Core;
+using Xunit;
+
+namespace StellaOps.Replay.Core.Tests;
+
+public sealed class CanonicalJsonTests
+{
+    [Fact]
+    public void CanonicalJson_OrdersPropertiesLexicographically()
+    {
+        var payload = new
+        {
+            zeta = 1,
+            alpha = new { z = 9, m = 7 },
+            list = new[] { new { y = 2, x = 1 } }
+        };
+
+        var canonical = CanonicalJson.Serialize(payload);
+
+        canonical.Should().Be("{\"alpha\":{\"m\":7,\"z\":9},\"list\":[{\"x\":1,\"y\":2}],\"zeta\":1}");
+    }
+
+    [Fact]
+    public void CanonicalJson_PreservesNumbersAndBooleans()
+    {
+        var payload = JsonSerializer.Deserialize<JsonElement>("{\"b\":true,\"a\":1.25}");
+
+        var canonical = CanonicalJson.Serialize(payload);
+
+        canonical.Should().Be("{\"a\":1.25,\"b\":true}");
+    }
+}