my blog. for you.

Let’s talk digital.

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.

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 ...

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 ...

Sunday November 12th, 2023 by Bjoern in Enterprise Software, Software

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, ...

Sunday November 5th, 2023 by Bjoern in Enterprise Software, Software

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

Sunday September 10th, 2023 by Bjoern in Enterprise Software, Software

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

Sunday July 9th, 2023 by Bjoern in Enterprise Software, Software

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

Sunday December 25th, 2022 by Bjoern in Enterprise Software, Software

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

Sunday August 21st, 2022 by Bjoern in Enterprise Software, Software

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:

Sunday July 3rd, 2022 by Bjoern in Enterprise Software, Software

Clearing the Spring Security Context During Unit Testing

Last week I wrote about a minimal Spring Security Context setup for unit testing. I'd like to add just a tiny, yet depending on your use case perhaps quite important, tidbit to that: In case you need to reset a SecurityContext setup, e.g., a mocked user authentication, because, for instance, other test methods from the same unit test class verify behaviour for an unauthenticated application state and hence expect an anonymous user, you can clear the SecurityContext (for example, in your ...

Sunday February 27th, 2022 by Bjoern in Enterprise Software, Software

Minimal Spring Security Context Setup for Unit Testing

Creating a minimal Spring Security setup for JUnit unit tests can be a tedious as well as somewhat daunting task. With its Authentication, Principal, GrantedAuthority, and UserDetails classes Spring Security is extremely flexible and configurable and probably accommodates pretty much every authentication and authorization use case under the sun. However, in software architecture such flexibility often comes at price, the trade-off in this case being that simple use cases can require more implementation effort than one would expect. One such use case ...

Sunday February 20th, 2022 by Bjoern in Enterprise Software, Software

Björn Wilmsmann

my blog. for you.

Let’s talk digital.