Hegel.Xunit 0.1.3

.NET 10.0 This package targets .NET 10.0. The package is compatible with this framework or higher. 
dotnet add package Hegel.Xunit --version 0.1.3
                    


                    

                
NuGet\Install-Package Hegel.Xunit -Version 0.1.3
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Hegel.Xunit" Version="0.1.3" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Hegel.Xunit" Version="0.1.3" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Hegel.Xunit" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add Hegel.Xunit --version 0.1.3
                    


                    

                
#r "nuget: Hegel.Xunit, 0.1.3"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package Hegel.Xunit@0.1.3
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=Hegel.Xunit&version=0.1.3
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Hegel.Xunit&version=0.1.3
                    


                            Install as a Cake Tool

hegel-dotnet

Property-based testing for F#, powered by the native Hegel engine. Write properties; the engine generates inputs and shrinks failures to a minimal counterexample — you never write a shrinker.

Early (v0.1): primitives, core combinators, collections, and the [<Property>] xUnit attribute. Not yet full Hypothesis parity.

Install

dotnet add package Hegel.Xunit   # pulls in Hegel transitively

Quickstart

module Example

open Xunit
open Hegel
open Hegel.Xunit

[<Property>]
let ``reversing a list twice is the identity`` (tc: TestCase) =
    let xs = tc.Draw(Gen.lists (Gen.integers ()))
    Assert.Equal<int list>(xs, xs |> List.rev |> List.rev)

dotnet test runs it as one node over many generated cases; a failure prints the shrunk counterexample (e.g. Falsifying example: 100).

Generators

Draw with tc.Draw(gen):
Primitives integers longs booleans floats text bytes — ints take .Min(..).Max(..)
Combinators map bind filter optional oneOf sampledFrom just
Collections lists set maps tuple2 tuple3

gen { } sequences dependent draws:

gen {
    let! lo = Gen.integers().Min(0).Max(100)
    let! hi = Gen.integers().Min(lo).Max(200)
    return (lo, hi)
}

How it works

A thin client over the native libhegel (Rust) — P/Invoke + CBOR, no Python or subprocess. Generators are deterministic functions of the engine's choice sequence, so shrinking runs engine-side. The native ships per-RID in the package (osx-arm64, linux-x64/arm64, win-x64/arm64); override it with HEGEL_LIBHEGEL_PATH.

Develop

nix develop   # pinned .NET 10 SDK (+ just, python3)
just build
just test
just pack     # fetch all natives + build the packages

License

MIT. The bundled libhegel is MIT (© Antithesis, LLC) — see THIRD-PARTY-NOTICES.txt.

Product Compatible and additional computed target framework versions.
.NET net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
0.1.3 36 7/4/2026
0.1.1 40 7/3/2026
0.1.0 40 7/3/2026