When did we forget that tests were software? When did we decide that tests didn't need to follow the rules of software design? The fact is that the tests we write are *part* of our software system, and are subject to all the same rules that our other software modules are subject too.
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The SOLID Principles of Test Design
Robert Martin (@unclebobmartin) has been a programmer since 1970. He is the Master Craftsman at 8th Light inc, an acclaimed speaker at conferences worldwide, and the author of many books including: The Clean Coder, Clean Code, Agile Software Development: Principles, Patterns, and Practices, and UML for Java Programmers.