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What is FsCheck?

FsCheck is a tool for testing .NET programs automatically. The programmer provides a specification of the program, in the form of properties which functions, methods or objects should satisfy, and FsCheck then tests that the properties hold in a large number of randomly generated cases. While writing the properties, you are actually writing a testable specification of your program. Specifications are expressed in F#, C# or VB, using combinators defined in the FsCheck library. FsCheck provides combinators to define properties, observe the distribution of test data, and define test data generators. When a property fails, FsCheck automatically displays a minimal counter example.

FsCheck is a port of Haskell's QuickCheck. Important parts of the manual for using FsCheck is almost literally adapted from the QuickCheck manual. Any errors and omissions are entirely my responsibility.

Since v0.5, scalacheck has influenced FsCheck as well. Scalacheck is itself a port of QuickCheck to Scala.

FsCheck's generator combinators can be used in any testing framework to easily generate a number of random values for many types, and FsCheck itself integrates nicely with existing unit testing frameworks such as NUnit, xUnit, MSTest and MbUnit.

NuGet

Documentation

Yes, please

More reading

  • Blog for announcements, change logs and other posts more or less related to FsCheck.
  • An interesting read about QuickCheck is in Chapter 11 of the excellent Real world Haskell book. The book is freely available online, but do the authors a favor and buy it, it's really worth it also for F# programmers.

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Random Testing for .NET

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