TUnit

A modern, flexible and fast testing framework for .NET 8 and up. With Native AOT and Trimmed Single File application support included!

Documentation

See here: https://thomhurst.github.io/TUnit/

IDE

TUnit is built on top of the newer Microsoft.Testing.Platform, as opposed to the older VSTest platform. Because the infrastructure behind the scenes is new and different, you may need to enable some settings. This should just be a one time thing.

Visual Studio

Visual Studio is supported on the Preview version currently.

• Install the latest preview version
• Open Visual Studio and go to Tools > Manage Preview Features
• Enable "Use testing platform server mode"

Rider

Rider is supported. The Enable Testing Platform support option must be selected in Settings > Build, Execution, Deployment > Unit Testing > VSTest.

VS Code

Visual Studio Code is supported.

• Install the extension Name: C# Dev Kit
• Go to the C# Dev Kit extension's settings
• Enable Dotnet > Test Window > Use Testing Platform Protocol

CLI

dotnet CLI - Fully supported. Tests should be runnable with dotnet test, dotnet run, dotnet exec or executing an executable directly. See the docs for more information!

Features

• Native AOT / Trimmed Single File application support
• Source generated tests
• Dependency injection support (See here)
• Full async support
• Parallel by default, with mechanisms to:
  • Run specific tests completely on their own
  • Run specific tests not in parallel with other specific tests
  • Limit the parallel limit on a per-test, class or assembly level
• Test ordering (if running not in parallel)
• Tests can depend on other tests to form chains, useful for if one test depends on state from another action
• Easy to read assertions
• Injectable test data via classes, methods, compile-time args, or matrices
• Hooks before and after:
  • TestDiscover
  • TestSession
  • Assembly
  • Class
  • Test
• Designed to avoid common pitfalls such as leaky test states
• Ability to view and interrogate metadata and results from various assembly/class/test context objects

Installation

dotnet add package TUnit --prerelease

Example test

    private static readonly TimeOnly Midnight = TimeOnly.FromTimeSpan(TimeSpan.Zero);
    private static readonly TimeOnly Noon = TimeOnly.FromTimeSpan(TimeSpan.FromHours(12));
    
    [Test]
    public async Task IsMorning()
    {
        var time = GetTime();

        await Assert.That(time).IsAfterOrEqualTo(Midnight)
            .And.IsBefore(Noon);
    }

or with more complex test orchestration needs

    [Before(Class)]
    public static async Task ClearDatabase(ClassHookContext context) { ... }

    [After(Class)]
    public static async Task AssertDatabaseIsAsExpected(ClassHookContext context) { ... }

    [Before(Test)]
    public async Task CreatePlaywrightBrowser(TestContext context) { ... }

    [After(Test)]
    public async Task DisposePlaywrightBrowser(TestContext context) { ... }

    [Retry(3)]
    [Test, DisplayName("Register an account")]
    [MethodData(nameof(GetAuthDetails))]
    public async Task Register(string username, string password) { ... }

    [Repeat(5)]
    [Test, DependsOn(nameof(Register))]
    [MethodData(nameof(GetAuthDetails))]
    public async Task Login(string username, string password) { ... }

    [Test, DependsOn(nameof(Login), [typeof(string), typeof(string)])]
    [MethodData(nameof(GetAuthDetails))]
    public async Task DeleteAccount(string username, string password) { ... }

    [Category("Downloads")]
    [Timeout(300_000)]
    [Test, NotInParallel(Order = 1)]
    public async Task DownloadFile1() { ... }

    [Category("Downloads")]
    [Timeout(300_000)]
    [Test, NotInParallel(Order = 2)]
    public async Task DownloadFile2() { ... }

    [Repeat(10)]
    [Test]
    [Arguments(1)]
    [Arguments(2)]
    [Arguments(3)]
    [DisplayName("Go to the page numbered $page")]
    public async Task GoToPage(int page) { ... }

    [Category("Cookies")]
    [Test, Skip("Not yet built!")]
    public async Task CheckCookies() { ... }

    [Test, Explicit, WindowsOnlyTest, RetryHttpServiceUnavailable(5)]
    [Property("Some Key", "Some Value")]
    public async Task Ping() { ... }

    [Test]
    [ParallelLimit<LoadTestParallelLimit>]
    [Repeat(1000)]
    public async Task LoadHomepage() { ... }

    public static IEnumerable<(string Username, string Password)> GetAuthDetails()
    {
        yield return ("user1", "password1");
        yield return ("user2", "password2");
        yield return ("user3", "password3");
    }

    public class WindowsOnlyTestAttribute : SkipAttribute
    {
        public WindowsOnlyTestAttribute() : base("Windows only test")
        {
        }

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

    public class RetryHttpServiceUnavailableAttribute : RetryAttribute
    {
        public RetryHttpServiceUnavailableAttribute(int times) : base(times)
        {
        }

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

    public class LoadTestParallelLimit : IParallelLimit
    {
        public int Limit => 50;
    }

Motivations

TUnit is inspired by NUnit and xUnit - two of the most popular testing frameworks for .NET.

It aims to build upon the useful features of both while trying to address any pain points that they may have.

Read more here

Benchmark

Scenario: Building the test project

ubuntu-latest

BenchmarkDotNet v0.14.0, Ubuntu 22.04.5 LTS (Jammy Jellyfish)
AMD EPYC 7763, 1 CPU, 4 logical and 2 physical cores
.NET SDK 8.0.401
  [Host]     : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2
  DefaultJob : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2

Method	Mean	Error	StdDev
Build_TUnit	1.503 s	0.0186 s	0.0174 s
Build_NUnit	1.367 s	0.0246 s	0.0218 s
Build_xUnit	1.389 s	0.0261 s	0.0256 s
Build_MSTest	1.401 s	0.0217 s	0.0203 s

macos-latest

BenchmarkDotNet v0.14.0, macOS Sonoma 14.6.1 (23G93) [Darwin 23.6.0]
Apple M1 (Virtual), 1 CPU, 3 logical and 3 physical cores
.NET SDK 8.0.401
  [Host]     : .NET 8.0.8 (8.0.824.36612), Arm64 RyuJIT AdvSIMD
  DefaultJob : .NET 8.0.8 (8.0.824.36612), Arm64 RyuJIT AdvSIMD

Method	Mean	Error	StdDev
Build_TUnit	798.4 ms	15.94 ms	38.80 ms
Build_NUnit	708.5 ms	9.16 ms	8.12 ms
Build_xUnit	720.2 ms	14.04 ms	23.46 ms
Build_MSTest	806.3 ms	14.54 ms	28.36 ms

windows-latest

BenchmarkDotNet v0.14.0, Windows 10 (10.0.20348.2700) (Hyper-V)
AMD EPYC 7763, 1 CPU, 4 logical and 2 physical cores
.NET SDK 8.0.401
  [Host]     : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2
  DefaultJob : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2

Method	Mean	Error	StdDev
Build_TUnit	1.438 s	0.0230 s	0.0204 s
Build_NUnit	1.327 s	0.0263 s	0.0360 s
Build_xUnit	1.305 s	0.0133 s	0.0124 s
Build_MSTest	1.311 s	0.0164 s	0.0154 s

Scenario: A single test that completes instantly (including spawning a new process and initialising the test framework)

macos-latest

BenchmarkDotNet v0.14.0, macOS Sonoma 14.6.1 (23G93) [Darwin 23.6.0]
Apple M1 (Virtual), 1 CPU, 3 logical and 3 physical cores
.NET SDK 8.0.401
  [Host]     : .NET 8.0.8 (8.0.824.36612), Arm64 RyuJIT AdvSIMD
  DefaultJob : .NET 8.0.8 (8.0.824.36612), Arm64 RyuJIT AdvSIMD

Method	Mean	Error	StdDev
TUnit_AOT	72.43 ms	0.231 ms	0.181 ms
TUnit	412.14 ms	8.050 ms	8.266 ms
NUnit	690.06 ms	5.151 ms	4.819 ms
xUnit	671.04 ms	7.818 ms	6.931 ms
MSTest	620.74 ms	5.177 ms	4.589 ms

ubuntu-latest

BenchmarkDotNet v0.14.0, Ubuntu 22.04.5 LTS (Jammy Jellyfish)
AMD EPYC 7763, 1 CPU, 4 logical and 2 physical cores
.NET SDK 8.0.401
  [Host]     : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2
  DefaultJob : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2

Method	Mean	Error	StdDev
TUnit_AOT	47.91 ms	0.957 ms	2.330 ms
TUnit	745.38 ms	14.757 ms	14.493 ms
NUnit	1,330.08 ms	12.932 ms	12.096 ms
xUnit	1,314.56 ms	16.741 ms	15.659 ms
MSTest	1,186.12 ms	10.155 ms	9.499 ms

windows-latest

BenchmarkDotNet v0.14.0, Windows 10 (10.0.20348.2700) (Hyper-V)
AMD EPYC 7763, 1 CPU, 4 logical and 2 physical cores
.NET SDK 8.0.401
  [Host]     : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2
  DefaultJob : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2

Method	Mean	Error	StdDev
TUnit_AOT	77.99 ms	0.158 ms	0.123 ms
TUnit	743.85 ms	14.824 ms	20.291 ms
NUnit	1,292.80 ms	17.655 ms	15.651 ms
xUnit	1,270.45 ms	4.779 ms	4.470 ms
MSTest	1,146.49 ms	5.951 ms	4.969 ms

Scenario: A test that takes 50ms to execute, repeated 100 times (including spawning a new process and initialising the test framework)

ubuntu-latest

BenchmarkDotNet v0.14.0, Ubuntu 22.04.5 LTS (Jammy Jellyfish)
AMD EPYC 7763, 1 CPU, 4 logical and 2 physical cores
.NET SDK 8.0.401
  [Host]     : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2
  DefaultJob : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2

Method	Mean	Error	StdDev
TUnit_AOT	85.36 ms	1.705 ms	4.610 ms
TUnit	817.81 ms	16.051 ms	21.428 ms
NUnit	6,316.01 ms	12.274 ms	11.481 ms
xUnit	6,381.16 ms	8.258 ms	6.895 ms
MSTest	6,303.23 ms	4.667 ms	4.137 ms

windows-latest

BenchmarkDotNet v0.14.0, Windows 10 (10.0.20348.2700) (Hyper-V)
AMD EPYC 7763, 1 CPU, 4 logical and 2 physical cores
.NET SDK 8.0.401
  [Host]     : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2
  DefaultJob : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2

Method	Mean	Error	StdDev
TUnit_AOT	134.4 ms	2.66 ms	6.47 ms
TUnit	820.1 ms	16.05 ms	25.45 ms
NUnit	7,495.1 ms	15.67 ms	14.65 ms
xUnit	7,470.2 ms	19.83 ms	18.55 ms
MSTest	7,438.2 ms	21.00 ms	19.65 ms

macos-latest

BenchmarkDotNet v0.14.0, macOS Sonoma 14.6.1 (23G93) [Darwin 23.6.0]
Apple M1 (Virtual), 1 CPU, 3 logical and 3 physical cores
.NET SDK 8.0.401
  [Host]     : .NET 8.0.8 (8.0.824.36612), Arm64 RyuJIT AdvSIMD
  DefaultJob : .NET 8.0.8 (8.0.824.36612), Arm64 RyuJIT AdvSIMD

Method	Mean	Error	StdDev
TUnit_AOT	256.8 ms	13.75 ms	40.32 ms
TUnit	561.9 ms	21.80 ms	64.28 ms
NUnit	14,283.7 ms	284.26 ms	561.11 ms
xUnit	14,362.4 ms	285.59 ms	536.42 ms
MSTest	14,571.3 ms	283.40 ms	481.24 ms