Summary

In this chapter, you learned how to do different kinds of automated testing with F#. We started with one of the most popular techniques in .NET and other programming languages or platforms: unit testing. In F#, we can use some of the most widely used unit testing tools for .NET, such as NUnit, and benefit from its extensive functionality and compatibility with different IDEs. F# has some niceties on its own, such as having more informative names for tests and idiomatic syntax.

We then continued with property-based testing. This is not exclusive of F# or other functional programming languages, but the absence of a shared state makes it usually much easier to test properties of our functions for any given set of parameters. FsCheck makes property testing a breeze by automatically generating hundreds of samples to feed into our functions, and gives a stronger indication of robustness than simple unit tests can. FsCheck also has several tools to helps us locate problems, like shrinkers...