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FSharp.Hedgehog

FSharp.Hedgehog is a free property-based testing system for .NET that generates inputs to help developers find edge cases.

Place
#20 of 28
Score
5.5
FSharp.Hedgehog's website

What FSharp.Hedgehog is

FSharp.Hedgehog is a free property-based testing system for .NET that generates inputs to help developers find edge cases. It supports F#, C#, and other .NET languages, and works with any .NET test framework; xUnit V3 is also listed as a supported test runner. When a property fails, Hedgehog reduces the generated input to a smaller counterexample while keeping it within the generator’s invariants. Generators can be composed to describe structured and recursive data, and range combinators control the scope and growth of generated numeric and collection values. Explicit seed control makes runs deterministic, while shrink trees are available for debugging. The library offers F# computation expressions and supports LINQ syntax for generators and properties. It runs on Linux, macOS, and Windows and is licensed under Apache License 2.0. The project provides GitHub Issues and Discussions for support. It has a free plan and no free trial; its project pages do not specify a platform-specific installation method.

Good

  • Works with any .NET test framework.
  • Shrinking preserves generated-value invariants.
  • Explicit seeds support deterministic runs.
  • Supports Linux, macOS, and Windows.
  • Free under Apache License 2.0.

Watch out

  • No free trial is listed.
  • Project pages do not state a platform-specific installation method.

Who it suits

Hedgehog suits .NET developers writing tests in F#, C#, or another .NET language who want generated inputs and smaller failure examples. It is relevant to teams using any .NET test framework, including xUnit V3.

Verdict

Hedgehog offers .NET developers input generation, invariant-preserving shrinking, and reproducible runs at no cost. Check the GitHub project for installation details and support options.

The facts

Each one read from FSharp.Hedgehog's own pages, with the date it was checked.

What it does

Debugging
The project lists shrink trees as available for debugging.checked 8 Oct 2026
Deterministic runs
The repository lists explicit seed control for deterministic test runs.checked 8 Oct 2026
Example test count
The documentation example reports a property passing 100 tests.checked 8 Oct 2026
Failure shrinking
When a property fails, Hedgehog simplifies the failing input to find a smaller counterexample.checked 8 Oct 2026
Generators
It includes generators for primitive values and composable operations for building generators for complex types.checked 8 Oct 2026
Installation
The opened project pages do not state a download or platform-specific installation method.checked 8 Oct 2026
Integrated shrinking
When a property fails, Hedgehog shrinks the failing input to a smaller counterexample while preserving the generated values’ invariants.checked 8 Oct 2026
Intended users
The project describes the library as property-based testing for .NET developers writing tests in F#, C#, or other .NET languages.checked 8 Oct 2026
Invariant preserving
Its integrated shrinking keeps shrunk values within the invariants of the generators.checked 8 Oct 2026
Languages
The repository says Hedgehog can be used from F#, C#, or other .NET languages.checked 8 Oct 2026
License
The repository license is Apache License 2.0.checked 8 Oct 2026
Purpose
Hedgehog is a property-based testing system for .NET that automatically generates inputs to help find edge cases.checked 8 Oct 2026
Range control
Range combinators control the scope and growth of generated numeric and collection values.checked 8 Oct 2026
Reproducibility
Runs can be made deterministic using explicit seed control.checked 8 Oct 2026
Security
The opened project pages provide no security or compliance claims.checked 8 Oct 2026
Support
The repository exposes GitHub Issues and Discussions for the project.checked 8 Oct 2026
Supported languages
The project says it can be used from F#, C#, and other .NET languages.checked 8 Oct 2026
Syntax
Hedgehog provides F# computation expressions and supports LINQ syntax for generators and properties.checked 8 Oct 2026
Test framework compatibility
Hedgehog works with any .NET test framework.checked 8 Oct 2026
Test frameworks
The repository says Hedgehog works with any .NET test framework.checked 8 Oct 2026

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