𝐓𝐨𝐝𝐚𝐲, 𝐀𝐩𝐫𝐢𝐥 27, is the last day to secure your spot at the 𝐞𝐚𝐫𝐥𝐲-𝐛𝐢𝐫𝐝 𝐫𝐚𝐭𝐞 for my workshop 𝐖𝐞𝐥𝐥-𝐁𝐚𝐥𝐚𝐧𝐜𝐞𝐝 𝐓𝐞𝐬𝐭-𝐃𝐫𝐢𝐯𝐞𝐧 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭. Join us on 𝐌𝐚𝐲 21-22, 2026 at 𝐓𝐡𝐞 𝐁𝐫𝐚𝐢𝐧 𝐄𝐦𝐛𝐚𝐬𝐬𝐲 𝐢𝐧 𝐀𝐧𝐭𝐰𝐞𝐫𝐩 .

Don’t miss this final chance to invest in your skills at a reduced price.

🔗 𝐒𝐞𝐜𝐮𝐫𝐞 𝐲𝐨𝐮𝐫 𝐬𝐩𝐨𝐭 𝐧𝐨𝐰.

For more information: https://principal-it.eu/training/well-balanced-test-driven-development.html

#tdd #testdrivendevelopment #unittests #unittesting #softwaredesign

Letting the implementation details of the Subject Under Test seep into your test code quickly becomes problematic. It harms readability, forcing readers to decipher the test’s behavior, sometimes even debug it, just to understand what’s happening. Tests should be simple and easy to understand! That’s why it’s crucial to keep the domain knowledge in the production code, and out of your tests.

https://principal-it.eu/2020/09/prevent-domain-knowledge-from-sneaking-into-solitary-tests/

#tdd #testdrivendevelopment #unittests #unittesting #softwaredesign

Yay! The tests I wrote this evening failed! And then after I wrote a bit of code most of them passed. Bit more to do tomorrow.

#TestDrivenDevelopment #IDeserveCake

New article: Tales Of TDD - One Test Double To Rule Them All
A short story about the pragmatic use of test doubles.
https://principal-it.eu/2026/03/tdd-tales-one-test-double/

#tdd #testdrivendevelopment #unittests #unittesting #softwaredesign

Without proper TDD, developers keep pinging Google AI Studio to generate missing unit tests, turning AI assistance into a reminder service. Discover why solid test‑driven practices still matter for reliable AI‑powered code and how open‑source teams can avoid this trap. #AIStudio #TestDrivenDevelopment #UnitTests #GoogleAI

🔗 https://aidailypost.com/news/lack-tdd-forces-constant-reminders-google-ai-studio-tests

A story about why #TestDrivenDevelopment matters

This week, I have been working on an invoicing system in a legacy codebase. The requirements are to extend the invoice report with additional custom fields. What we'll test here is not the visual, but the (in-memory) field values that are ultimately displayed on the invoice report.
So I first wrote the test for the header fields, _let the test fail_, and continued with the actual implementation until the test passed...

1/?

#SoftwareEngineering

One of the books that had a profound impact during my early years as a software developer was “Debugging Applications for Microsoft .NET and Microsoft Windows” by John Robbins. I fondly remember the following paragraph from one of the first chapters of the book. (1/2)

#tdd #testdrivendevelopment #unittests #unittesting #softwaredesign