From e65a5d3b8bdf16c98ffc59c5283abdc36ba76af4 Mon Sep 17 00:00:00 2001
From: "deepsource-autofix[bot]"
 <62050782+deepsource-autofix[bot]@users.noreply.github.com>
Date: Thu, 18 Sep 2025 20:15:56 +0000
Subject: [PATCH] refactor: mark fields as readonly

This PR updates class fields that are only assigned during construction to be `readonly`, improving immutability and ensuring thread-safety.

- **Fields initialized only in constructors can be made `readonly`**: Several private fields (`Requests`, `DomainService`, and `AggregateRepository`) were found to be assigned only at declaration or inside constructors. Each has been prefixed with the `readonly` modifier to prevent unintended reassignment and better document their immutability.

> This Autofix was generated by AI. Please review the change before merging.
---
 CallbackHandler.BusinessLogic.Tests/Mediator/MediatorTests.cs | 2 +-
 .../Services/CallbackDomainServiceTests.cs                    | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/CallbackHandler.BusinessLogic.Tests/Mediator/MediatorTests.cs b/CallbackHandler.BusinessLogic.Tests/Mediator/MediatorTests.cs
index 1fafb06..55a1ae8 100644
--- a/CallbackHandler.BusinessLogic.Tests/Mediator/MediatorTests.cs
+++ b/CallbackHandler.BusinessLogic.Tests/Mediator/MediatorTests.cs
@@ -20,7 +20,7 @@ namespace CallbackHandler.BusinessLogic.Tests.Mediator
 
     public class MediatorTests
     {
-        private List<IBaseRequest> Requests = new List<IBaseRequest>();
+        private readonly List<IBaseRequest> Requests = new List<IBaseRequest>();
 
         public MediatorTests()
         {
diff --git a/CallbackHandler.BusinessLogic.Tests/Services/CallbackDomainServiceTests.cs b/CallbackHandler.BusinessLogic.Tests/Services/CallbackDomainServiceTests.cs
index 7d78a48..92ad2e6 100644
--- a/CallbackHandler.BusinessLogic.Tests/Services/CallbackDomainServiceTests.cs
+++ b/CallbackHandler.BusinessLogic.Tests/Services/CallbackDomainServiceTests.cs
@@ -19,9 +19,9 @@ namespace CallbackHandler.BusinessLogic.Tests.Services
 
     public class CallbackDomainServiceTests
     {
-        private ICallbackDomainService DomainService;
+        private readonly ICallbackDomainService DomainService;
 
-        private Mock<IAggregateRepository<CallbackMessageAggregate, DomainEvent>> AggregateRepository;
+        private readonly Mock<IAggregateRepository<CallbackMessageAggregate, DomainEvent>> AggregateRepository;
         public CallbackDomainServiceTests() {
             this.AggregateRepository = new Mock<IAggregateRepository<CallbackMessageAggregate, DomainEvent>>();
             this.DomainService = new CallbackDomainService(this.AggregateRepository.Object);