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Application testing is one of the most important parts of writing software. Research into the costs of software maintenance have revealed that a software defect can cost up to 25 times more to fix if it makes it to a production environment than if it had been caught during development. At the same time, a lot of testing involves repetitive, dull, and error-prone work that must be undertaken every time you make a change to your code base. The easiest way to counter this is to produce repeatable automated tests that can be executed by a computer on demand. This chapter looks at a specific type of automated testing that focuses on individual components, or units, of a system. Having a suite of automated unit tests gives you the power to verify that your individual components all work as specified even after making radical changes to them.
Visual Studio 2015 has a built-in framework for authoring, executing, and reporting on test cases. This chapter focuses ...