Blog & Artikel von Torsten Mandry

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Zu blöd für Vibe Coding?

Vibe Coding, also die Generierung von Code mit Hilfe von AI, gewinnt zunehmend an Popularität. Mit Claude Code hat Anthropic ein Tool entwickelt, welches mir zum ersten Mal das Gefühl gegeben hat, dass diese Art von Coding damit auch für mich funktionieren könnte. Ich hab’s ausprobiert, mit einer Problemstellung, die dafür wie gemacht zu sein schien. Lest nach, wie es mir dabei ergangen ist und welche Erkenntnisse ich gewonnen habe. Spoiler: es hat funktioniert, am Ende, irgendwie, aber war das noch Vibe Coding?

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Test organization and naming

As our system grows, so will our test suites. For our production code, we have learned techniques to keep it maintainable. For example, we try to structure our logic into sub-aspects, put them in specific locations and give the units meaningful names. We want to achieve the same for our tests. One of the main goals is that a developer - or generally speaking, the person who has to maintain the test - knows where to find which test. We also want to understand as quickly as possible what the test is for and what might be the reason for a failing test.

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Test Strategy
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Tests Granularity

In two previous posts we discussed the benefits of automated tests and the properties of a good test. So far we were trying to avoid differentiating the tests in any way. This time we want to address one way how tests can be classified: tests granularity.

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Anatomy of a Good Test

In our last post, we focused on why we should write tests and what value they provide. This time we will go far more technical and take a look at a single test. We will show what makes a test a good one and describe desired and unwanted properties. Interestingly enough, all those properties hold, no matter how isolated or integrated the test is. This already gives us a hint that all tests are alike, we should remember that. Unfortunately, as the topic is very broad, we will have to skip some aspects that play a role when we’re talking about test suites. We will get back to them in one of our next posts.

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Why you should write automated tests
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Visualizing the progress of a refactoring into a hexagonal architecture using jQAssistant

In my last project, we decided to refactor the inner structure of one of our services into a Hexagonal Architecture. It was clear that this was no task that could be done within a couple of days. During this long-running refactoring, we wanted to make our progress visible. Where are we now? What did we already have achieved? What do we still have to do? In this blog post, I describe the approach we took and how it helped us with our task.

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Cookie-based Spring Security Session

If you need authentication within your Spring Boot web application, the natural choice is to use Spring Security. It’s easy to use and, as long as you stick close to the defaults, it’s also quite easy to configure. But, by sticking to those defaults, you will automatically get a session that is persisted on the server-side. That’s a problem.

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Scraping a Docker Swarm service with Prometheus
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About unit and integration tests

The terms unit test and integration test are typically used as something different, or even opposite. In this blog post I explain why this is misleading and how I prefer to talk about isolation vs. integration instead.

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code-your-model

Some time ago I was looking for some simple, lightweight tool to document a complex, modularized model. I was not able to find anything that fits my requirements or expectations, so I came up with my own idea. Today, a good 15 months later, I want to introduce it to you.

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Prometheus Counters and how to deal with them
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Testen von Microservice-Systemen

Automatisiertes Testen ist in der Softwareentwicklung mittlerweile ein Standardvorgehen. Im Kontext eines verteilten Microservice-Systems wird üblicherweise das korrekte Verhalten jedes einzelne Services mit Hilfe von Unit-, Integrations- und End-2-End Tests verifiziert. Wie aber kann das Zusammenspiel der einzelnen Services getestet und sichergestellt werden? Die Idee, End-2-End Tests des Gesamtsystems zu erstellen, ist naheliegend. Ist dies aber sinnvoll, oder gibt es andere, besser geeignete Ansätze?

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Domain Exceptions?

In jedem Softwaresystem kommt es zu Ausnahmesituationen. In der Regel handelt es sich um technische Ausnahmen, die in Java als Exceptions auftreten und behandelt werden. Gibt es aber auch fachliche Ausnahmen, also quasi «Domain Exceptions»? Und ist es sinnvoll, diese in Java als Exceptions zu modellieren? Einige Beispiele aus einem Kundenprojekt zeigen, dass dies häufig nicht der Fall ist.