The Little Mocker | 8th Light We can say that a Mock is a kind of spy, a spy is a kind of stub, and a stub is a kind of dummy. But a fake isn’t a kind of any of them. It’s a completely different kind of test double.
Uncle Bob Martin walks through the “Prime Factors” kata in Java (29m06s) to illustrate the concept of Transformation Priority Premise as a way to address the common complaint about TDD: the brainlessness “As the tests get more specific, the code gets more generic.” … and “here’s the list of transformations” (47m53s): So what are these transformations? Perhaps we can make a list of them: ({}–>nil) no code at all->code that employs nil (nil->constant) (constant->constant+) a simple constant to a more complex constant (constant->scalar) replacing a constant with a variable or an argument (statement->statements) adding more unconditional statements....