TUnit
TUnit is a modern .NET testing framework built on Microsoft.Testing.Platform that emphasizes compile-time test discovery, parallel execution by default, and Native AOT support. It offers familiar syntax to users of xUnit, NUnit, and MSTest while adding source-generated tests, async assertions, and extensible hooks.
Key facts
Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.
| Field | Value |
|---|---|
| Repository | thomhurst/TUnit |
| Owner | thomhurst |
| Primary language | C# |
| License | MIT — OSI-approved |
| Stars | 3.9k |
| Forks | 127 |
| Open issues | 26 |
| Latest release | v1.58.0 (2026-07-01) |
| Last updated | 2026-07-08 |
| Source | https://github.com/thomhurst/TUnit |
What TUnit is
TUnit uses Roslyn source generators to discover and compile tests at build time rather than reflection at runtime, enabling faster startup and better IDE integration. Tests run in parallel by default with dependency ordering via `[DependsOn]`, supports data-driven testing through `[Arguments]`, `[Matrix]`, and custom `DataSourceGenerator<T>`, and includes AOT/trimming-safe mocking and assertion libraries.
Get the TUnit source
Clone the repository and explore it locally.
git clone https://github.com/thomhurst/TUnit.gitcd TUnit# follow the project's README for install & configurationNeed it deployed, integrated, or customized instead? DEV.co ships production installs.
Best use cases
Implementation considerations
- Compile-time test discovery requires tests to be in source; dynamic test generation via reflection is not supported. Tests must be compilable at build time.
- Parallel execution is default; tests must be designed as independent or explicitly ordered with `[DependsOn]` to avoid state corruption and race conditions.
- Source generators add a compilation step; initial build time may increase. Verify performance impact in your CI environment before wide adoption.
- IDE support varies; VS 2022 (17.13+) and Rider work out of the box, but earlier versions or VS Code require feature flags or extensions.
- Extensive use of `async` assertions and hooks requires async-aware test authoring; synchronous legacy test patterns will need refactoring.
When to avoid it — and what to weigh
- Require broad ecosystem of third-party test plugins — TUnit is young (first release Jan 2024); ecosystem of integrations, extensions, and community plugins is still developing compared to xUnit or NUnit.
- Need .NET Framework or .NET Core < 8 support — Not stated in DATA, but Microsoft.Testing.Platform targets modern .NET. Requires explicit clarification of minimum .NET version requirements.
- Team has deep investments in legacy test patterns or tooling — Parallel-by-default and source-generated discovery may require refactoring tests with undeclared state sharing, global setup, or reflection-based introspection.
- Cannot adopt pre-release or rapidly evolving frameworks — Latest release v1.58.0 (2026-07-01) suggests active, frequent iteration; breaking changes possible. Production adoption warrants stability review.
License & commercial use
TUnit is licensed under the MIT License, a permissive OSI-approved license allowing unrestricted use, modification, and distribution in commercial and private projects, with minimal attribution requirements.
MIT License explicitly permits commercial use without restrictions or royalties. No copyleft obligations. However, verify that Microsoft.Testing.Platform and all transitive dependencies also permit intended commercial use in your jurisdiction.
DEV.co evaluation signals
Editorial assessment — not user reviews. Directional, with an explicit confidence level.
| Signal | Assessment |
|---|---|
| Maintenance | Active |
| Documentation | Strong |
| License clarity | Clear |
| Deployment complexity | Moderate |
| DEV.co fit | Strong |
| Assessment confidence | High |
No security audit or penetration test data provided. As a testing framework, TUnit has limited attack surface compared to production libraries. Standard considerations: keep dependencies updated, review Roslyn source generator code if security-critical tests are involved, and validate that Microsoft.Testing.Platform dependencies are patched.
Alternatives to consider
xUnit.net
Mature, widely adopted, extensive ecosystem. Mature plugin support and stability, but reflection-based discovery; slower at scale and no Native AOT support.
NUnit
Long history, comprehensive assertion library, flexible parallelization. Similar ecosystem maturity to xUnit; less optimized for modern async/AOT patterns.
MSTest
Built into Visual Studio, integrated DevOps support. Tight coupling to Microsoft ecosystem; less community adoption and fewer third-party extensions than xUnit/NUnit.
Build on TUnit with DEV.co software developers
TUnit offers a modern alternative to xUnit and NUnit with compile-time efficiency and AOT support. Start with the migration guides or project template, then run a proof-of-concept against your largest test suite to measure parallel execution gains and validate IDE integration in your environment.
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TUnit FAQ
Can I use TUnit.Assertions with xUnit or NUnit?
How does parallel execution handle shared state?
What is the minimum .NET version required?
Is there commercial support or an SLA?
Software development & web development with DEV.co
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Ready to evaluate TUnit for your .NET test suite?
TUnit offers a modern alternative to xUnit and NUnit with compile-time efficiency and AOT support. Start with the migration guides or project template, then run a proof-of-concept against your largest test suite to measure parallel execution gains and validate IDE integration in your environment.