Restructure solution layout by module

src/Concelier/__Tests/StellaOps.Concelier.Models.Tests/SerializationDeterminismTests.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using StellaOps.Concelier.Models;
+using Xunit;
+
+namespace StellaOps.Concelier.Models.Tests;
+
+public sealed class SerializationDeterminismTests
+{
+    private static readonly string[] Cultures =
+    {
+        "en-US",
+        "fr-FR",
+        "tr-TR",
+        "ja-JP",
+        "ar-SA"
+    };
+
+    [Fact]
+    public void CanonicalSerializer_ProducesStableJsonAcrossCultures()
+    {
+        var examples = CanonicalExampleFactory.GetExamples().ToArray();
+        var baseline = SerializeUnderCulture(CultureInfo.InvariantCulture, examples);
+
+        foreach (var cultureName in Cultures)
+        {
+            var culture = CultureInfo.GetCultureInfo(cultureName);
+            var serialized = SerializeUnderCulture(culture, examples);
+
+            Assert.Equal(baseline.Count, serialized.Count);
+            for (var i = 0; i < baseline.Count; i++)
+            {
+                Assert.Equal(baseline[i].Compact, serialized[i].Compact);
+                Assert.Equal(baseline[i].Indented, serialized[i].Indented);
+            }
+        }
+    }
+
+    private static List<(string Name, string Compact, string Indented)> SerializeUnderCulture(
+        CultureInfo culture,
+        IReadOnlyList<(string Name, Advisory Advisory)> examples)
+    {
+        var originalCulture = CultureInfo.CurrentCulture;
+        var originalUiCulture = CultureInfo.CurrentUICulture;
+        try
+        {
+            CultureInfo.CurrentCulture = culture;
+            CultureInfo.CurrentUICulture = culture;
+
+            var results = new List<(string Name, string Compact, string Indented)>(examples.Count);
+            foreach (var (name, advisory) in examples)
+            {
+                var compact = CanonicalJsonSerializer.Serialize(advisory);
+                var indented = CanonicalJsonSerializer.SerializeIndented(advisory);
+                results.Add((name, compact, indented));
+            }
+
+            return results;
+        }
+        finally
+        {
+            CultureInfo.CurrentCulture = originalCulture;
+            CultureInfo.CurrentUICulture = originalUiCulture;
+        }
+    }
+}