By ueberhund “ueberhund” (Salt Lake City, UT United States), posted on Amazon.com:

“This is a great introduction to writing unit tests in C# with NUnit. The authors do a good job of explaining why unit tests should be created, how having unit tests are better than not having unit tests, and what exactly should be coded for in a unit test. The book is well-written, easy to follow, and includes helpful guidelines for things that might be confusing to developers.

The real strength of this book is not the author’s approach to writing unit tests, but rather they clearly illustrate what exactly should be tested in a unit test. The authors show how adhering to the guidelines they set forth results in unit tests that are well-written and fail at appropriate times. The authors then generalize this to some extent and provide an excellent discussion on the properties of a good unit test.

My favorite section of the book was actually one of the appendices. In the first appendix, the authors go through a list of gotchas—both in writing unit tests in general and specific to unit tests in C#. This is a very short discussion (only 6 pages), but they identify some issues I’ve seen with poorly written unit tests.

This is a great book as an introduction to writing unit tests. The authors clearly explain why unit tests should be written, they show clearly what should be tested in a unit test, and they describe some of the problems that have been avoided by writing intelligent unit tests.”