Foreword by Kent Beck "The authors of this book have led a revolution in the craft of programming by controlling the environment in which software grows." --Ward Cunningham "At last, a book suffused with code that exposes the deep symbiosis between TDD and OOD. This one's a keeper." --Robert C. Martin "If you want to be an expert in the state of the art in TDD, you need to understand the ideas in this book."--Michael Feathers Test-Driven Development (TDD) is now an established technique for delivering better software faster. TDD is based on a simple idea: Write tests for your code before you write the code itself. However, this "simple" idea takes skill and judgment to do well. Now there's a practical guide to TDD that takes you beyond the basic concepts. Drawing on a decade of experience building real-world systems, two TDD pioneers show how to let tests guide your development and "grow" software that is coherent, reliable, and maintainable. Steve Freeman and Nat Pryce describe the processes they use, the design principles they strive to achieve, and some of the tools that help them get the job done. Through an extended worked example, you'll learn how TDD works at multiple levels, using tests to drive the features and the object-oriented structure of the code, and using Mock Objects to discover and then describe relationships between objects. Along the way, the book systematically addresses challenges that development teams encounter with TDD--from integrating TDD into your processes to testing your most difficult features. Coverage includes * Implementing TDD effectively: getting started, and maintaining your momentum throughout the project * Creating cleaner, more expressive, more sustainable code * Using tests to stay relentlessly focused on sustaining quality * Understanding how TDD, Mock Objects, and Object-Oriented Design come together in the context of a real software development project * Using Mock Objects to guide object-oriented designs * Succeeding where TDD is difficult: managing complex test data, and testing persistence and concurrency

Steve Freeman和Nat Pryce是独立的软件顾问，他们是英国的敏捷软件开发先锋。他们都曾在一些行业和组织机构中工作过：电信业系统开发、金融业、体育新闻报道和市场传播、IBM的薄膜包装应用、工业和学术研究机构等。他们是伦敦XpDay的创始人和组织者，经常出席和组织国际会议。Steve和Nat是几个有影响的开源项目的贡献者，这些项目支持TDD。在2006年，他们共同获得了敏捷联盟的Gordon Pask奖。他们住在英国伦敦。