Test Driven Development is not really about testing, it is about design, and a particularly powerful form of evolutionary design. This allows us to make progress in small steps, taking fewer risks and evolving our system incrementally, learning as we go. But how do you do this for a real problem? This video demonstrates this incremental approach for a real-world, small project. In this episode Dave Farley describes how to use TDD to build your system in a series of small steps, using a project of his own to demonstrate the approach. Find Dave's Free TDD Tutorial (he refers to in this video) here ➡️ https://courses.cd.training/courses/tdd-tutorial - ⭐ PATREON: Join the Continuous Delivery community and access extra perks & content! JOIN HERE for as little as £2 ➡️ https://bit.ly/ContinuousDeliveryPatreon - 👕 T-SHIRTS: A fan of the T-shirts I wear in my videos? Grab your own, at reduced prices EXCLUSIVE TO CONTINUOUS DELIVERY FOLLOWERS! Get money off the already reasonably priced t-shirts! 🔗 Check out their collection HERE: https://bit.ly/3vTkWy3 🚨 DON'T FORGET TO USE THIS DISCOUNT CODE: ContinuousDelivery - BOOKS: 📖 Dave’s NEW BOOK "Modern Software Engineering" is available as paperback, or kindle here ➡️ https://amzn.to/3DwdwT3 and NOW as an AUDIOBOOK available on iTunes, Amazon and Audible. 📖 The original, award-winning "Continuous Delivery" book by Dave Farley and Jez Humble ➡️ https://amzn.to/2WxRYmx 📖 "Continuous Delivery Pipelines" by Dave Farley Paperback ➡️ https://amzn.to/3gIULlA ebook version ➡️ https://leanpub.com/cd-pipelines NOTE: If you click on one of the Amazon Affiliate links and buy the book, Continuous Delivery Ltd. will get a small fee for the recommendation with NO increase in cost to you. - CHANNEL SPONSORS: Equal Experts is a product software development consultancy with a network of over 1,000 experienced technology consultants globally. They increase the pace of innovation by using modern software engineering practices that embrace Continuous Delivery, Security, and Operability from the outset ➡️ https://bit.ly/3ASy8n0 Sleuth is the #1 most accurate and actionable DORA metrics tracker for improving engineering efficiency. Sleuth models your entire development cycle by integrating with the tools you already invest in. You get a full and accurate view of your deployments, see where true bottlenecks lie, and keep your team’s unique processes and workflows. With accurate data, Sleuth surfaces insights that your engineers can act on to improve – with real impact. ➡️ https://www.sleuth.io/ IcePanel is a collaborative diagramming tool to align software engineering and product teams on technical decisions across the business. Create an interactive map of your software systems and give your teams full context about how things work now and in the future. ➡️ http://u.icepanel.io/1f7b2db3 Tricentis is an AI-powered platform helping you to deliver digital innovation faster and with less risk by providing a fundamentally better approach to test automation. Discover the power of continuous testing with Tricentis. ➡️ https://bit.ly/TricentisCD TransFICC provides low-latency connectivity, automated trading workflows and e-trading systems for Fixed Income and Derivatives. TransFICC resolves the issue of market fragmentation by providing banks and asset managers with a unified low-latency, robust and scalable API, which provides connectivity to multiple trading venues while supporting numerous complex workflows across asset classes such as Rates and Credit Bonds, Repos, Mortgage-Backed Securities and Interest Rate Swaps ➡️ https://transficc.com/