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I’m an independent IT consultant and entrepreneur in the Internet and software business. I’m interested in design, enterprise applications, web apps and SaaS products. I design and develop business solutions and applications. I help companies in terms of software quality and knowledge transfer, e.g. with Angular and Spring Boot.

The Unknowns of JUnit 5 by Mike Kowalski @ Devoxx France 2022

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Spring Boot Tip: A Simplified Way of Creating ArgumentCaptors with Mockito 5.7.0

Maciej Walkowiak recently published this tip on a simplified way of creating Mockito ArgumentCaptors with Spring Boot 3.2.x: 💡 Mockito 5.7.0 (included in Spring Boot 3.2) introduced simplified way for creating argument captors:— Maciej Walkowiak 🍃 (@maciejwalkowiak) December 13, 2023 Read more

ArchUnit Spring Integration

ArchUnit is a tremendously useful library for enforcing Java application architecture via unit testing. Fellow software developer and consultant Roland Weisleder recently published a new library called ArchUnit Spring Integration that helps with - well - better integrating ArchUnit with Spring applications. By introducing a DSL, ArchUnit Spring Integration allows you to easily enforce constraints regarding common Spring stereotypes such as @RestController. For example, using ArchUnit Spring Integration you can make sure that methods annotated with @GetMapping (or other HTTP verb mappings, for ... Read more

Spring Boot & Flyway – How to Clear a Test Database Between Integration Tests

A few months ago, consultant and prolific open source contributor Maciej Walkowiak, of Spring Cloud AWS and just fame, wrote about clearing test databases between integration tests with Spring Boot and Flyway. The recipe / pattern for restoring a test database to its previous state (i.e. the state before a specific integration test has been executed) outlined in that article should come in handy to anyone working with Spring Boot. Moreover, the basic concept is generic enough to be applied to another ... Read more

WireMock Spring Boot

WireMock is an API mocking tool that enables developers to simulate REST APIs during testing. In a system-under-test fashion, it allows us to remove external, potentially flaky, dependencies from our test environment to make our unit tests more focussed and more reliable. WireMock Spring Boot is a new library by consultant and prolific open source contributor Maciej Walkowiak that "drastically simplifies WireMock configuration in a Spring Boot and JUnit 5 application". Featuring a fully declarative WireMock setup and automatic Spring environment setup, ... Read more

Testing with Spring, AOT, GraalVM, and JUnit 5 by Sam Brannen @ Spring I/O 2023

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Things I Wish I Knew When I Started Testing Spring Boot Applications by Philip Riecks @ Spring I/O

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Testcontainers and Spring Boot From Integration Tests to Local Development – Oleg Šelajev @ Spring I/O 2022

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Testing with Spring and JUnit 5 by Sam Brannen @ Spring I/O 2022

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How Fixing a Broken Window Cut Down Our Build Time by 50% By Philip Riecks @ Spring I/O 2022

At Spring I/O 2022, Philip Riecks, one of my fellow authors of "Stratospheric - From Zero to Production with Spring Boot and AWS" gave this interesting talk on reducing build time by addressing a "broken windows" problem that can occur if we take (too many) shortcuts when writing software tests: Read more
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