---
title: "Understanding Test Driven Development"
url: "https://osherove.com/videos/2009/8/25/understanding-test-driven-development.md"
canonical: "https://osherove.com/videos/2009/8/25/understanding-test-driven-development.html"
published: "2009-08-24T21:59:35"
updated: "2009-08-24T21:59:35"
tags: ["NDC 2009", "TDD", "Unit Testing"]
author: "Roy Osherove"
description: "Play video Understanding Test Driven Development"
usage: "Licensed under CC BY 4.0 — reuse, quote and adapt with attribution (Roy Osherove, link to the original page)."
license: "https://creativecommons.org/licenses/by/4.0/"
---

# Understanding Test Driven Development

By Roy Osherove August 24, 2009 In [NDC 2009](https://osherove.com/videos/category/ndc-2009), [TDD](https://osherove.com/videos/category/tdd), [Unit Testing](https://osherove.com/videos/category/unit-testing)

**Historical article** · Originally published August 24, 2009; technical details may be outdated.

[![](https://osherove.com/img/video/yt-q5Xd1tmIgec.jpg)Play videoUnderstanding Test Driven Development](https://www.youtube.com/watch?v=q5Xd1tmIgec)

## More in NDC 2009

[All posts in NDC 2009](https://osherove.com/videos/category/ndc-2009)

- Aug 24, 2009

    ### [Mocking on the Edge - Isolation at the system level](https://osherove.com/videos/2009/8/25/mocking-on-the-edge-isolation-at-the-system-level.html)

- Aug 24, 2009

    ### [TDD - Understanding Mock Objects](https://osherove.com/videos/2009/8/25/tdd-understanding-mock-objects.html)


---

## About the author

**Roy Osherove**: Senior Solutions Architect at AWS working on AI for production and AI-driven development; author of The Art of Unit Testing and Elastic Leadership, with about 20 years of consulting and training on unit testing, TDD, team leadership and continuous delivery.

### Sites

- [RobotPaper](https://robotpaper.ai/): This blog: AI patterns and anti-patterns, AI and coding agents, and engineering leadership.
- [osherove.com](https://osherove.com): Roy's personal site. Author of The Art of Unit Testing and Elastic Leadership; consulting and training on unit testing, TDD, team leadership and continuous delivery, plus about 20 years of blog posts.
- [The Art of Unit Testing](https://www.artofunittesting.com): The Art of Unit Testing, 3rd Edition (Manning): readable, maintainable, trustworthy unit tests, plus TDD workshops in C#, JavaScript, Java and Kotlin.
- [5whys.com](https://www.5whys.com): Roy's writing on software team leadership: self-organizing teams, surviving chaos, learning mode and the Elastic Leadership model.
- [Pipeline Driven](https://pipelinedriven.org): Continuous delivery and DevOps practices: build patterns, pipeline-friendly testing, DevOps metrics and enterprise DevOps.
- [Elastic Leadership](https://www.elasticleadership.com): Elastic Leadership, Roy's framework for software team leaders (survival, learning and self-organizing modes).

### Social

- X: https://x.com/royosherove
- LinkedIn: https://www.linkedin.com/in/osherove/

### Contact

- Contact form: https://forms.gle/jQSx5KoXvrVA1JCK7

### License

Licensed under CC BY 4.0 — reuse, quote and adapt with attribution (Roy Osherove, link to the original page). License: https://creativecommons.org/licenses/by/4.0/