Blog

Mert Özen's blog posts on software development, backend, frontend, and DevOps.

Series

.NET Core Web API 36 C# Fundamentals 20 Object-Oriented Programming in C# 16 C# Collections and Generics 11 LINQ 17 Asynchronous Programming in C# 17 Advanced C# 14 C# Versions 6 Background Jobs and Scheduled Jobs 11 Working with Message Queues 14 Logging in .NET 10 Caching 10 Real-time Applications 9 ASP.NET Core MVC and Razor Pages 13

14 posts found

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Backend PART 13

Testing Message Queue Code: Testcontainers, the MassTransit Test Harness and Contract Tests

Unit test the logic apart from the broker, test broker behavior against a real RabbitMQ with Testcontainers, and wait with signals and bounded polling instead of Task.Delay. The MassTransit test harness, the inactivity cost of negative asserts, a Total→TotalAmount rename silently turning into 0 under default JSON options, and the Microsoft.Testing.Platform setting xUnit v3 needs on .NET 10.

8 Nov 2026 12 min 5

Backend PART 14

Client Version Migrations: RabbitMQ.Client 6→7 (IModel to IChannel) and MassTransit 8→9

Moving to RabbitMQ.Client 7 gave 5 compiler errors on the first build and 10 more on the second; the real risks are the ones the compiler misses: body lifetime, timeouts becoming cancellations and concurrency. Plus RabbitMQ 4.x rejecting mirroring policies, queue type mismatches, the AMQP 1.0 client, MassTransit 9 refusing to start without a license, v8 support ending on 31 December 2026, and the old Service Bus SDK mapping.

8 Nov 2026 13 min 6