S6967: Add FP repro for #9261 (#9286)

analyzers/tests/SonarAnalyzer.Test/Rules/AspNet/CallModelStateIsValidTest.cs

@@ -38,7 +38,7 @@ public class CallModelStateIsValidTest
 
     [TestMethod]
     public void CallModelStateIsValid_CS() =>
-        builder.AddPaths("CallModelStateIsValid.cs").Verify();
+        builder.AddPaths("CallModelStateIsValid.cs", "CallModelStateIsValid.AutogeneratedController.cs").Verify();
 
     [TestMethod]
     public void CallModelStateIsValid_AssemblyLevelControllerAttribute_CS() =>

analyzers/tests/SonarAnalyzer.Test/TestCases/AspNet/CallModelStateIsValid.AutogeneratedController.cs

@@ -0,0 +1,19 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+// Repro https://github.com/SonarSource/sonar-dotnet/issues/9260
+// Also related to https://github.com/SonarSource/sonar-dotnet/issues/8876
+using Microsoft.AspNetCore.Mvc;
+
+public partial class AutogeneratedController : Controller
+{
+    // Repro for https://github.com/SonarSource/sonar-dotnet/issues/9261
+    // this will be fixed once https://github.com/SonarSource/sonar-dotnet/issues/8876 is fixed
+    [HttpPost]
+    public void Post(object model) { } // Noncompliant, FP we should not raise in autogenerated code.
+}