From d157acae683b7a6e6e3188c969afe9d8ce6f3003 Mon Sep 17 00:00:00 2001
From: Tom Longhurst <30480171+thomhurst@users.noreply.github.com>
Date: Thu, 16 Jul 2026 15:02:42 +0100
Subject: [PATCH] fix(benchmarks): make SetupTeardownTests JSON tests Native
 AOT compatible

JsonOperationTest and AsyncJsonOperationTest serialized an anonymous type
via reflection-based System.Text.Json, which is disabled under PublishAot
(JsonSerializerIsReflectionEnabledByDefault=false). Both tests threw at
runtime, failing the run, so BenchmarkDotNet reported NA for TUnit AOT in
the Setup/teardown lifecycle scenario and the README showed a dash.

Replace the anonymous type with a concrete record and a source-generated
JsonSerializerContext, which works under Native AOT and all four
frameworks. Verified by running the suite with the reflection feature
switch disabled: 22/22 pass.
---
 .../UnifiedTests/SetupTeardownTests.cs        | 25 ++++++++-----------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/tools/speed-comparison/UnifiedTests/SetupTeardownTests.cs b/tools/speed-comparison/UnifiedTests/SetupTeardownTests.cs
index 613d9a842a5..e28487101fd 100644
--- a/tools/speed-comparison/UnifiedTests/SetupTeardownTests.cs
+++ b/tools/speed-comparison/UnifiedTests/SetupTeardownTests.cs
@@ -353,13 +353,8 @@ public async Task AsyncDictionaryOperationTest()
     public void JsonOperationTest()
     {
         // Simulate JSON serialization
-        var data = new
-        {
-            Id = 123,
-            Name = "Test Data",
-            Values = Enumerable.Range(0, 50).ToArray()
-        };
-        var json = System.Text.Json.JsonSerializer.Serialize(data);
+        var data = new JsonPayload(123, "Test Data", Enumerable.Range(0, 50).ToArray());
+        var json = System.Text.Json.JsonSerializer.Serialize(data, BenchmarkJsonContext.Default.JsonPayload);
         _logBuilder.AppendLine($"JSON length: {json.Length}");
     }
 
@@ -368,13 +363,15 @@ public async Task AsyncJsonOperationTest()
     {
         // Simulate async JSON operations
         await Task.Delay(10);
-        var data = new
-        {
-            Id = 123,
-            Name = "Test Data",
-            Values = Enumerable.Range(0, 50).ToArray()
-        };
-        var json = System.Text.Json.JsonSerializer.Serialize(data);
+        var data = new JsonPayload(123, "Test Data", Enumerable.Range(0, 50).ToArray());
+        var json = System.Text.Json.JsonSerializer.Serialize(data, BenchmarkJsonContext.Default.JsonPayload);
         _logBuilder.AppendLine($"Async JSON length: {json.Length}");
     }
 }
+
+// Concrete DTO + source-generated serializer context so JSON tests work under Native AOT,
+// where reflection-based System.Text.Json serialization is disabled.
+public sealed record JsonPayload(int Id, string Name, int[] Values);
+
+[System.Text.Json.Serialization.JsonSerializable(typeof(JsonPayload))]
+internal partial class BenchmarkJsonContext : System.Text.Json.Serialization.JsonSerializerContext;