Prova 🇸🇪

Prova is a high-performance, Native AOT-compatible test runner for .NET. Use the xUnit syntax you already know, but with zero runtime reflection and instant startup.

Why Prova?

1. Zero Migration Cost

Your tests remain exactly the same. Prova supports standard xUnit attributes ([Fact], [Theory], [InlineData], Assert). You only change the runner.

2. Native Performance

Tests are discovered at compile-time using Source Generators and can be compiled to Native AOT. This eliminates runtime discovery costs and enables instant startup, making it ideal for high-frequency "inner loop" development or containerized CI environments.

3. Safe Parallelism

Tests run in parallel by default (Task.WhenAll), utilizing all available cores.

---

Quick Start

1. Install Code

dotnet add package Prova

2. Write Tests (Standard xUnit Syntax)

using Prova; // or 'using Xunit;' (Prova aliases this for compatibility)

public class CalculatorTests
{
    [Fact]
    public void Add_ReturnsSum()
    {
        Assert.Equal(4, 2 + 2);
    }

    [Theory]
    [InlineData(10, 2, 5)]
    [InlineData(20, 4, 5)]
    public void Divide_ReturnsQuotient(int a, int b, int expected)
    {
        Assert.Equal(expected, a / b);
    }
}

3. Run

dotnet run

---

Microsoft Testing Platform (MTP) Support

Prova integrates with the Microsoft Testing Platform. This enables support for dotnet test, TRX reporting, and code coverage without sacrificing AOT compatibility.

To enable dotnet test support:

1. Add a global.json to your solution root:

   { "test": { "runner": "Microsoft.Testing.Platform" } }

2. Run with standard tooling:

   dotnet test --coverage --report-trx

---

Advanced Features

While Prova is a drop-in replacement, it adds enterprise-grade features for strictly governed codebases.

Explicit Concurrency

Prevent thread pool starvation in massive test suites by bounding parallelism.

[Parallel(max: 4)] // Limits concurrency for this class
public class DatabaseTests { ... }

Allocation Governance

Enforce zero-allocation policies or strict memory budgets for critical paths.

[Fact]
[MaxAlloc(0)] // Fails if the test allocates any memory on the heap
public void HotPath_ShouldNotAllocate() { ... }

Flakiness Management

[Fact]
[Retry(3)] // Automatically retry flaky network tests
public void IntegrationTest() { ... }

Focused Execution

Run only the specific test you are debugging (similar to .only in Jest).

[Fact]
[Focus] // Prova will ONLY generate and run this test
public void DebuggingThisRightNow() { ... }

---

Contributing

We welcome issues and pull requests. Please see CONTRIBUTING.md for details.

See it in Action

Prova produces clean, hierarchical output that is easy to parse visually.

License

MIT