4 Test Design
If you look at the three laws of test-driven development (TDD), presented in Chapter 2, “Test-Driven Development,” you could come to the conclusion that TDD is a shallow skill: Follow the three laws, and you are done. This is far from the truth. TDD is a deep skill. There are many layers to it; and they take months, if not years, to master.
In this section, we delve into just a few of those layers, ranging from various testing conundrums, such as databases and graphical user interfaces (GUIs), to the design principles that drive good test design, to patterns of testing, and to some interesting and profound theoretical possibilities. ...
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