Design for Testability in Practice

Nir Szilagyi

With the drive for continuous integration and delivery, the implications and approaches for designing more testable software are receiving substantial discussion and debate. What does testability really mean in practice? How do you take the idea of testability—how easy it is to test software—and put it into action through the different dimensions of designing and testing a real-world product? Nir Szilagyi recognizes that the challenges of difficult-to-test software can transform a testing cycle from a small automation and exploratory effort to a long struggle of test preparation, execution, and debugging. He says testability starts with software design, goes through implementation, and encompasses building modular software, abstraction, simplicity, clear data interface, separation of business logic into self-sustained entities, and more. On the technical side of testability, Nir explores ways quality engineers and leaders can influence testability from early development through deployment. From his experiences Nir shares real-life testability examples which touch on the human process of building software including the relationship between testers and developers.

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