Advanced Parallelism

Prova provides granular control over test concurrency using Limiters and Groups.

Parallel Limiters

Use [ParallelLimiter] to restrict the number of concurrent tests that share a specific resource.

public class DatabaseTests
{
    // Only 5 tests with key "DB" can run at the same time.
    [Fact]
    [ParallelLimiter("DB", 5)]
    public async Task HeavyQuery1() 
    {
        await Task.Delay(1000);
    }
}

This acts like a specialized Semaphore, ensuring you don't overwhelm shared resources (databases, APIs, file handles).

Parallel Groups

Use [ParallelGroup] to logically group tests. Currently, this serves as metadata for reporting and future scheduling optimizations.

[Fact]
[ParallelGroup("Integration")]
public void Test1() { }

NotInParallel

The [NotInParallel("key")] attribute is a shorthand for [ParallelLimiter("key", 1)]. It enforces strict serial execution for the given resource.