By Stephen Vance
• Simplify unit trying out of all of your code—and increase integration and method testing
• Delineate reason and implementation to advertise extra trustworthy and scalable testing
• conquer confusion and misunderstandings in regards to the mechanics of writing tests
• attempt “side effects,” behavioral features, and contextual constraints
• comprehend refined interactions among layout and testability—and lead them to paintings for, no longer opposed to, you
• notice middle ideas that advisor your key trying out decisions
• discover checking out getters/setters, string dealing with, encapsulation, override adaptations, visibility, singleton styles, mistakes stipulations, and more
• Reproduce and try out advanced race stipulations deterministically
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Additional resources for Quality Code: Software Testing Principles, Practices, and Patterns
25 26 Chapter 3 Where Do I Start? to a product. Raw materials or component parts have a value when you receive them that is subtracted out of the value of the product you sell for purpose of taxation. Similarly, your code takes the libraries and collaborators on which it is built and adds an additional level of functionality or purpose for its consumers: the value added by that code. Defining a unit test has caused considerable debate, but the valueadded perspective gives us an alternative. Many have used definitions like that put forth by Michael Feathers3 stating what a unit test does not do.
Well-written unit tests have exactly the opposite characteristics. The principles and techniques in this book will help you understand the reasons unit testing can become entangled and how to avoid them. Unit Testing under Code Checker Constraints Earlier, I mentioned that you should use tools to automate as many craftsmanship concerns as you can. If your tests drive the quality of your development, then you need to apply good craftsmanship to your tests as well. Not only should your tools check your application code, they should also check your test code to almost the same standards.
The presence of both a getter and setter for pollFrequency but only a getter for feed reinforces that reading. But that only gives us an understanding of the implementation intent. What functional intent might this support? We could make a reasonable conclusion in the context that exactly one of these classes should be allocated for each news feed we could use. We could also infer that perhaps there is exactly one NewsFeed per score to be monitored, which is used to initialize the ScoreWatcher.