Steve Freeman offers advice on writing good tests that make development easier avoiding adding dead weight code that is hard to maintain. Freeman covers the following areas: test readability, complex test data, test diagnostics, and test flexibility.
Steve Freeman was a pioneer of Agile software development in the UK, he has given training courses in Europe, America, and Asia. Previously, he worked in research labs, software houses, earned a PhD, and wrote shrink-wrap software for IBM. Steve also teaches in the Computer Science department at University College London. He is co-author of the JMock framework.
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Tests Are Code!
I would also recommend using Groovy as the testing language for an even more concise test code, especially since 1.7 with the Power Asserts (docs.codehaus.org/display/GROOVY/Groovy+1.7+rel...)