Functional Testing books
See the main testfunc page here.
Beta Testing for Better Software
Black Box Testing
How to Break Software:A practical guide to testing.
Junit in Action
JUnit Pocket Guide
JUnit: The Definitive Guide
Lessons Learned in Software Testing
Nunit Pocket Reference
Practical Guide to Testing Object-Oriented Software
Pragmatic Unit Testing In Java with Junit
Software Quality Engineering: Testing, Quality Assurance, and Quantifiable Improvement
Testing Applications on the Web, 2nd Edition
Testing Computer Software
Unit Testing in Java
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