Further Reading
An excellent source for information on unit testing is Test Driven Development By Example by Kent Beck (Addison-Wesley). The book uses Java and Python examples, but its approach is relatively language agnostic. Another excellent resource is the JUnit homepage, at www.junit.org.
If you are interested in learning more about the Extreme Programming methodology, see Testing Extreme Programming, by Lisa Crispin and Tip House (Addison-Wesley), and Extreme Programming Explained: Embrace Change, by Kent Beck (Addison-Wesley), which are both great books.
Refactoring: Improving the Design of Existing Code, by Martin Fowler (Addison-Wesley), is an excellent text that discusses patterns in code refactoring. The examples in the book focus on Java, but the patterns are very general.
There are a huge number of books on qualitative analysis of readability, but if you are primarily interested in learning about the actual formulas used, you can do a Google search on readability score to turn up a number of high-quality results.
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