#161: Test-Driven Development in the Age of AI with Clare Sudbery

AI might write your code, but can you trust it to do it well? Clare Sudbery says: not without a safety net. In this episode, she explains how test-driven development is evolving in the age of AI, and why developers need to slow down, not speed up. Overview In this episode, Brian sits down with Clare Sudbery, experienced developer, TDD advocate, and all-around brilliant explainer, to unpack the evolving relationship between test-driven development and AI-generated code. From skeptical beginnings to cautiously optimistic experimentation, Clare shares how testing isn’t just still relevant, it might be more essential than ever. They explore how TDD offers a safety net when using GenAI tools, the risks of blindly trusting AI output, and why treating AI like a helpful human is where many developers go wrong. Whether you’re an AI early adopter or still on the fence, this conversation will sharpen your thinking about quality, ethics, and the role of human judgment in modern software development. References and resources mentioned in the show: Clare Sudbery Clare’s upcoming Software Architecture Gathering 2025 workshop Clare at GOTO AI Practice Prompts For Scrum Masters #99: AI & Agile Learning with Hunter Hillegas #117: How AI and Automation Are Redefining Success for Developers with Lance Dacy Subscribe to the Agile Mentors Podcast Want to get involved? This show is designed for you, and we’d love your input. Enjoyed what you heard today? Please leave a rating and a review. It really helps, and we read every single one. Got an Agile subject you’d like us to discuss or a question that needs an answer? Share your thoughts with us at podcast@mountaingoatsoftware.com This episode’s presenters are: Brian Milner is a Certified Scrum Trainer®, Certified Scrum Professional®, Certified ScrumMaster®, and Certified Scrum Product Owner®, and host of the Agile Mentors Podcast training at Mountain Goat Software. He's passionate about making a difference in people's day-to-day work, influenced by his own experience of transitioning to Scrum and seeing improvements in work/life balance, honesty, respect, and the quality of work. Clare Sudbery is an independent technical coach, conference speaker, and published novelist who helps teams rediscover their “geek joy” through better software practices. She writes and speaks widely on test‑driven development, ethical AI, and women in tech, bringing clarity, humor, and decades of hands‑on experience to every talk and workshop. Auto-generated Transcript: Brian Milner (00:00) Welcome in, Agile Mentors. We're back for another episode of the Agile Mentors Podcast. I'm here, as always, Brian Milner. But today, I have Miss Claire Sudbury with me. Welcome in, Claire. Clare Sudbery (00:13) Hello. Brian Milner (00:14) I'm so happy to have you here. is here with us because we wanted to talk about a topic that I think is going to be interesting to lot of people, and that is test-driven development, but not just test-driven development in light of AI and kind of the changes that AI has made to test-driven development. So why don't we start with just the base level test-driven development for people who have only heard kind of buzzwords around it and aren't as familiar with it, how would you explain test-driven development in sort of plain English? Clare Sudbery (00:47) Okay, so the idea of test-driven development is that you want to be certain that your code works. And I'm sure most people will be familiar with the idea of writing tests around your code to prove that it works. But that principle is considered so important in test-driven development that we write the test before we write the code. And that's why we say that the development is driven by the tests. So the very starting point for any coding exercise is a test. Another really important part of this is that that test is tiny. So what we're not doing, and people might have heard of behavior-driven development, which is wh