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haf/expecto

This system is the Expecto testing framework for .NET, providing a comprehensive suite for writing and executing unit, integration, and performance tests. It supports multiple testing paradigms, including property-based testing via FsCheck, asynchronous testing with Hopac, and benchmarking with BenchmarkDotNet. The framework offers a C#-friendly API and colorized diff output for improved test failure readability. The codebase has been modernized to .NET 10.0, with legacy components like Fuchu removed.

53.2

Adequate · 20 July 2026

5.7k

lines of production code

F#

primary language

3

bus factor · 74 authors in all

2

measurements over time

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How it got here

2012 · Modernization and infrastructure cleanup

This period focused on modernizing the project's build infrastructure by migrating to .NET 10.0 and updating CI/CD configurations. Simultaneously, obsolete test modules and documentation files were removed to streamline the codebase.

5 changes

2016 · C# integration and ecosystem expansion

This period focused on expanding Expecto's compatibility with C# and the broader .NET ecosystem. The team introduced a dedicated C#-friendly API, added support for async tests, and integrated with FsCheck and BenchmarkDotNet to enhance property-based and performance testing capabilities.

5 changes

2017–2018 · multi-language and async test support

This period focused on expanding Expecto's test capabilities by introducing C# and Hopac integration, alongside new test suites for focused testing and performance benchmarking. The work added features for writing and running tests in C# and via Hopac's Job type, while also establishing benchmarks to measure serialiser performance.

5 changes

2019–2026 · Build automation and template integration

This period focused on improving the developer experience and build infrastructure for the Expecto framework. Key changes included introducing a new build automation script to streamline the release pipeline, adding an official project template for easier project setup, and integrating support for FsCheck3 for property-based testing.

4 changes

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About this page

  • The description of this project is derived from its own commit history, not from its README.
  • The score is its highest published measurement, taken on 20 July 2026 at a pinned commit. It is not a live figure and does not change until the project is measured again.
  • Measured at commit cec2c63c8d — the exact code this score is about.
  • Scored under rubric rubric-2026.08.17. Score the same commit under that rubric and you get the same number.
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