Further Reading

Motivation – the first step to learning TDD

• Fearless Change: Patterns for Introducing New Ideas by Mary Lynn Manns Ph.D. and Linda Rising Ph.D. is worth looking at.
• Resistance Is Not to Change by Al Shalloway

The Essential Tools

• Gerard Meszaros has written a long book about using the XUnit family of test frameworks, called XUnit Test Patterns. This book also explains a lot of philosophy behind these tools.

Value Objects

• Ken Pugh has a chapter devoted to value objects in his book Prefactoring (the name of the chapter is Abstract Data Types).
• Growing Object Oriented Software Guided By Tests contains some examples of using value objects and some strategies on refactoring towards them.
• Value object discussion on C2 wiki.
• Martin Fowler’s bliki mentions value objects. They are also one of the patterns in his book Patterns of Enterprise Application Architecture
• Arlo Beshele describes how he uses value objects (described under the name of Whole Value) much more than I do in this book, presenting an alternative design style that is closer to functional that the one I write about.
• Implementation Patterns book by Kent Beck includes value object as one of the patterns.