API integration testing with a contract-driven mock server — Testcontainers is an open-source multi-language framework that has revolutionised integration testing by leveraging containerisation. The concept is simple yet powerful: developers define and spin up Docker containers directly from the test code. …

Wait, is that really possible? — Contract testing has emerged as a trending topic for developers and teams working with APIs. There is already a pyramid of layers of testing, so do we need another one? What is special about it and what is the value? But most importantly, from my OpenAPI specification can I implement…

Shift left with Postman and OpenAPI specification — There are plenty of excellent and well-established tools that help design, create and validate an OpenAPI specification. But surely it is (at least) as critical to ensuring that the API contracts are honoured by the API we are developing. In this article: find out how you can use Postman to…

Generating client and server source code — The API economy is on fire 🔥🔥🔥 It has been on fire for years. Applications need to talk, systems must exchange data, and business processes require the implementation of sophisticated workflows composing existing services and functions. Fortunately, the OpenAPI initiative is playing a key role in defining, through the vast…

Blogging for developers: a practical effective checklist — Recently I had the pleasure (and fun) of speaking at JFall, the most significant Java event in the Netherlands. It was a lightning talk (20 slides — no more, no less — 15 seconds per slide — with auto-forward!?) …

Three different ways to deploy Docker images. — In this article: Heroku drops the free tier, why Fly.io is a better platform, and the different ways to deploy your Dockerized applications on Fly.io. Heroku announced in August the end of the free tier of the application hosting and data services, to be focusing only on (paying) mission-critical applications…

Hi Glen, thanks for the nice feedback. If you don't use containers my first thought would be to run Playwright using the preferred language (you can write tests in JS, Python, etc..) without the need to use Docker. The tests-in-a-container work if the application is also a container accessible (same host ideally) by Playwright. There might be ways to connect containers and apps distributed but the architecture complexity and mainteance effort would make it not worthwhile. Hope this helps.

Best features of the OpenAPI code generation — This article explores the Mustache templates, in the context of the OpenAPI specification, and the underrated features that can help developers in optimizing the code generation. At Adyen we adopted OpenAPI specs some time ago and we have created our own Mustache templates to streamline the generation of the Adyen…

Automated testing of the Adyen Sample integrations — Playwright is a modern framework that simplifies the creation and maintenance of web application end-to-end (E2E) testing. The landscape of e2e testing solutions, to be honest, is already rich with tools and frameworks, however Playwright joins the party with some distinctive features (cross-platform, cross-browser, cross-language) and a powerful maintainer (Microsoft).