Name: TUnit.Engine
Author: Tom Longhurst

TUnit.Engine v1.9.91 — nugetz

Feature	Traditional Frameworks	TUnit
Test Discovery	❌ Runtime reflection	✅ Compile-time generation
Execution Speed	❌ Sequential by default	✅ Parallel by default
Modern .NET	⚠️ Limited AOT support	✅ Native AOT & trimming
Test Dependencies	❌ Not supported	✅ `[DependsOn]` chains
Resource Management	❌ Manual lifecycle	✅ Automatic cleanup

dotnet new install TUnit.Templates
dotnet new TUnit -n "MyTestProject"

dotnet add package TUnit --prerelease

[Test]
public async Task User_Creation_Should_Set_Timestamp()
{
    // Arrange
    var userService = new UserService();

    // Act
    var user = await userService.CreateUserAsync("john.doe@example.com");

    // Assert - TUnit's fluent assertions
    await Assert.That(user.CreatedAt)
        .IsEqualTo(DateTime.Now)
        .Within(TimeSpan.FromMinutes(1));

    await Assert.That(user.Email)
        .IsEqualTo("john.doe@example.com");
}

[Test]
[Arguments("user1@test.com", "ValidPassword123")]
[Arguments("user2@test.com", "AnotherPassword456")]
[Arguments("admin@test.com", "AdminPass789")]
public async Task User_Login_Should_Succeed(string email, string password)
{
    var result = await authService.LoginAsync(email, password);
    await Assert.That(result.IsSuccess).IsTrue();
}

// Matrix testing - tests all combinations
[Test]
[MatrixDataSource]
public async Task Database_Operations_Work(
    [Matrix("Create", "Update", "Delete")] string operation,
    [Matrix("User", "Product", "Order")] string entity)
{
    await Assert.That(await ExecuteOperation(operation, entity))
        .IsTrue();
}

[Before(Class)]
public static async Task SetupDatabase(ClassHookContext context)
{
    await DatabaseHelper.InitializeAsync();
}

[Test, DisplayName("Register a new account")]
[MethodDataSource(nameof(GetTestUsers))]
public async Task Register_User(string username, string password)
{
    // Test implementation
}

[Test, DependsOn(nameof(Register_User))]
[Retry(3)] // Retry on failure
public async Task Login_With_Registered_User(string username, string password)
{
    // This test runs after Register_User completes
}

[Test]
[ParallelLimit<LoadTestParallelLimit>] // Custom parallel control
[Repeat(100)] // Run 100 times
public async Task Load_Test_Homepage()
{
    // Performance testing
}

// Custom attributes
[Test, WindowsOnly, RetryOnHttpError(5)]
public async Task Windows_Specific_Feature()
{
    // Platform-specific test with custom retry logic
}

public class LoadTestParallelLimit : IParallelLimit
{
    public int Limit => 10; // Limit to 10 concurrent executions
}

// Custom conditional execution
public class WindowsOnlyAttribute : SkipAttribute
{
    public WindowsOnlyAttribute() : base("Windows only test") { }

    public override Task<bool> ShouldSkip(TestContext testContext)
        => Task.FromResult(!OperatingSystem.IsWindows());
}

// Custom retry logic
public class RetryOnHttpErrorAttribute : RetryAttribute
{
    public RetryOnHttpErrorAttribute(int times) : base(times) { }

    public override Task<bool> ShouldRetry(TestInformation testInformation,
        Exception exception, int currentRetryCount)
        => Task.FromResult(exception is HttpRequestException { StatusCode: HttpStatusCode.ServiceUnavailable });
}

[Test]
[Arguments(1, 2, 3)]
[Arguments(5, 10, 15)]
public async Task Calculate_Sum(int a, int b, int expected)
{
    await Assert.That(Calculator.Add(a, b))
        .IsEqualTo(expected);
}

[Test, DependsOn(nameof(CreateUser))]
public async Task Login_After_Registration()
{
    // Runs after CreateUser completes
    var result = await authService.Login(user);
    await Assert.That(result.IsSuccess).IsTrue();
}

[Test]
[ParallelLimit<LoadTestLimit>]
[Repeat(1000)]
public async Task API_Handles_Concurrent_Requests()
{
    await Assert.That(await httpClient.GetAsync("/api/health"))
        .HasStatusCode(HttpStatusCode.OK);
}

Package	Use Case
`TUnit`	Start here - Complete testing framework (includes Core + Engine + Assertions)
`TUnit.Core`	Test libraries and shared components (no execution engine)
`TUnit.Engine`	Test execution engine and adapter (for test projects)
`TUnit.Assertions`	Standalone assertions (works with any test framework)
`TUnit.Playwright`	Playwright integration with automatic lifecycle management

// TUnit test with dependency management and retries
[Test]
[Arguments("value1")]
[Arguments("value2")]
[Retry(3)]
[ParallelLimit<CustomLimit>]
public async Task Modern_TUnit_Test(string value) { }

# Create a new test project
dotnet new install TUnit.Templates && dotnet new TUnit -n "MyTestProject"

# Or add to existing project
dotnet add package TUnit --prerelease


BenchmarkDotNet v0.15.6, Linux Ubuntu 24.04.3 LTS (Noble Numbat)
AMD EPYC 7763 2.45GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.100-rc.2.25502.107
  [Host]     : .NET 10.0.0 (10.0.0-rc.2.25502.107, 10.0.25.50307), X64 RyuJIT x86-64-v3
  Job-GVKUBM : .NET 10.0.0 (10.0.0-rc.2.25502.107, 10.0.25.50307), X64 RyuJIT x86-64-v3

Runtime=.NET 10.0

Method	Version	Mean	Error	StdDev	Median
Build_TUnit	1.0.48	1.798 s	0.0345 s	0.0424 s	1.785 s
Build_NUnit	4.4.0	1.575 s	0.0169 s	0.0158 s	1.573 s
Build_MSTest	4.0.1	1.659 s	0.0150 s	0.0140 s	1.658 s
Build_xUnit3	3.2.0	1.579 s	0.0182 s	0.0170 s	1.575 s


BenchmarkDotNet v0.15.6, Linux Ubuntu 24.04.3 LTS (Noble Numbat)
AMD EPYC 7763 2.45GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.100-rc.2.25502.107
  [Host]     : .NET 10.0.0 (10.0.0-rc.2.25502.107, 10.0.25.50307), X64 RyuJIT x86-64-v3
  Job-GVKUBM : .NET 10.0.0 (10.0.0-rc.2.25502.107, 10.0.25.50307), X64 RyuJIT x86-64-v3

Runtime=.NET 10.0

Method	Version	Mean	Error	StdDev	Median
TUnit	1.0.48	562.4 ms	4.18 ms	3.91 ms	561.0 ms
NUnit	4.4.0	679.2 ms	7.24 ms	6.41 ms	679.6 ms
MSTest	4.0.1	647.7 ms	8.63 ms	7.65 ms	647.8 ms
xUnit3	3.2.0	744.4 ms	11.90 ms	10.55 ms	741.5 ms
TUnit_AOT	1.0.48	127.6 ms	0.45 ms	0.42 ms	127.6 ms


BenchmarkDotNet v0.15.6, Linux Ubuntu 24.04.3 LTS (Noble Numbat)
AMD EPYC 7763 2.45GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.100-rc.2.25502.107
  [Host]     : .NET 10.0.0 (10.0.0-rc.2.25502.107, 10.0.25.50307), X64 RyuJIT x86-64-v3
  Job-GVKUBM : .NET 10.0.0 (10.0.0-rc.2.25502.107, 10.0.25.50307), X64 RyuJIT x86-64-v3

Runtime=.NET 10.0

Method	Version	Mean	Error	StdDev	Median
TUnit	1.0.48	476.97 ms	5.430 ms	5.080 ms	478.26 ms
NUnit	4.4.0	537.80 ms	6.692 ms	6.260 ms	537.55 ms
MSTest	4.0.1	496.84 ms	9.188 ms	8.145 ms	496.37 ms
xUnit3	3.2.0	584.15 ms	10.733 ms	10.039 ms	582.13 ms
TUnit_AOT	1.0.48	24.65 ms	0.177 ms	0.157 ms	24.68 ms


BenchmarkDotNet v0.15.6, Linux Ubuntu 24.04.3 LTS (Noble Numbat)
AMD EPYC 7763 2.45GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.100-rc.2.25502.107
  [Host]     : .NET 10.0.0 (10.0.0-rc.2.25502.107, 10.0.25.50307), X64 RyuJIT x86-64-v3
  Job-GVKUBM : .NET 10.0.0 (10.0.0-rc.2.25502.107, 10.0.25.50307), X64 RyuJIT x86-64-v3

Runtime=.NET 10.0

Method	Version	Mean	Error	StdDev	Median
TUnit	1.0.48	578.1 ms	5.79 ms	5.13 ms	577.3 ms
NUnit	4.4.0	1,220.5 ms	7.43 ms	6.20 ms	1,220.9 ms
MSTest	4.0.1	3,005.3 ms	13.91 ms	12.33 ms	3,003.4 ms
xUnit3	3.2.0	3,096.0 ms	11.11 ms	10.40 ms	3,094.6 ms
TUnit_AOT	1.0.48	130.6 ms	0.39 ms	0.36 ms	130.7 ms


BenchmarkDotNet v0.15.6, Linux Ubuntu 24.04.3 LTS (Noble Numbat)
AMD EPYC 7763 2.45GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.100-rc.2.25502.107
  [Host]     : .NET 10.0.0 (10.0.0-rc.2.25502.107, 10.0.25.50307), X64 RyuJIT x86-64-v3
  Job-GVKUBM : .NET 10.0.0 (10.0.0-rc.2.25502.107, 10.0.25.50307), X64 RyuJIT x86-64-v3

Runtime=.NET 10.0

Method	Version	Mean	Error	StdDev	Median
TUnit	1.0.48	544.97 ms	5.561 ms	4.930 ms	544.99 ms
NUnit	4.4.0	1,540.60 ms	5.644 ms	4.713 ms	1,540.91 ms
MSTest	4.0.1	1,499.17 ms	4.590 ms	3.833 ms	1,499.42 ms
xUnit3	3.2.0	1,591.72 ms	6.560 ms	6.136 ms	1,592.55 ms
TUnit_AOT	1.0.48	79.41 ms	0.252 ms	0.236 ms	79.48 ms


BenchmarkDotNet v0.15.6, Linux Ubuntu 24.04.3 LTS (Noble Numbat)
AMD EPYC 7763 2.45GHz, 1 CPU, 4 logical and 2 physical cores
.NET SDK 10.0.100-rc.2.25502.107
  [Host]     : .NET 10.0.0 (10.0.0-rc.2.25502.107, 10.0.25.50307), X64 RyuJIT x86-64-v3
  Job-GVKUBM : .NET 10.0.0 (10.0.0-rc.2.25502.107, 10.0.25.50307), X64 RyuJIT x86-64-v3

Runtime=.NET 10.0

Method	Version	Mean	Error	StdDev	Median
TUnit	1.0.48	498.22 ms	7.188 ms	6.723 ms	496.45 ms
NUnit	4.4.0	584.65 ms	11.669 ms	11.461 ms	582.38 ms
MSTest	4.0.1	580.53 ms	11.233 ms	15.747 ms	583.58 ms
xUnit3	3.2.0	587.89 ms	8.750 ms	7.757 ms	586.15 ms
TUnit_AOT	1.0.48	46.75 ms	1.442 ms	4.253 ms	47.33 ms

thomhurst/TUnit.Enginev1.9.91

Get Started

Readme

🚀 The Modern Testing Framework for .NET

Why TUnit?

Documentation

Quick Start

Using the Project Template (Recommended)

Manual Installation

Key Features

Simple Test Example

Data-Driven Testing

Advanced Test Orchestration

Custom Test Control

Common Use Cases

Unit Testing

Integration Testing

Load Testing

What Makes TUnit Different?

Compile-Time Test Discovery

Parallel by Default

Extensible

Community & Ecosystem

Resources

IDE Support

Visual Studio (2022 17.13+)

JetBrains Rider

Visual Studio Code

Command Line

Package Options

Migration from Other Frameworks

Getting Started

Performance Benchmark

Scenario: Building the test project

Scenario: Tests running asynchronous operations and async/await patterns

Scenario: Parameterized tests with multiple test cases using data attributes

Scenario: Tests executing massively parallel workloads with CPU-bound, I/O-bound, and mixed operations

Scenario: Tests with complex parameter combinations creating 25-125 test variations

Scenario: Large-scale parameterized tests with 100+ test cases testing framework scalability