Top 19 C# Xunit Projects

xUnit

1 44 4,405 9.6 C#

xUnit.net is a free, open source, community-focused unit testing tool for .NET.

Project mention: Primeiros testes unitários em C# com xUnit (parte 1) | dev.to | 2025-04-04
Stream

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Cake

2 15 4,034 9.0 C#

:cake: Cake (C# Make) is a cross platform build automation system.

Project mention: Learn Makefiles | news.ycombinator.com | 2025-06-20
Fluent Assertions

3 15 3,808 9.4 C#

A very extensive set of extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style unit tests. Targets .NET Framework 4.7, as well as .NET Core 2.1, .NET Core 3.0, .NET 6, .NET Standard 2.0 and 2.1. Supports the unit test frameworks MSTest2, NUnit3, XUnit2, MSpec, and NSpec3.

Project mention: Fluent Assertions 8: Corporate License Update | dev.to | 2025-01-17

The new commercial license costs $129.95 per developer per year. This pricing structure impacts organizations, especially those with larger development teams or multiple projects utilizing Fluent Assertions.
AutoFixture

4 13 3,470 2.8 C#

AutoFixture is an open source library for .NET designed to minimize the 'Arrange' phase of your unit tests in order to maximize maintainability. Its primary goal is to allow developers to focus on what is being tested rather than how to setup the test scenario, by making it easier to create object graphs containing test data.

Project mention: Why I moved from AutoFixture to Bogus for test data generation for C#/xUnit tests | dev.to | 2025-07-05

AutoFixture and Bogus are both well-known libraries for generating test data in C# tests. AutoFixture is, well, dated whereas Bogus is state of the art.
bUnit

5 4 1,230 8.6 C#

bUnit is a testing library for Blazor components that make tests look, feel, and runs like regular unit tests. bUnit makes it easy to render and control a component under test’s life-cycle, pass parameter and inject services into it, trigger event handlers, and verify the rendered markup from the component using a built-in semantic HTML comparer.
LightBDD

6 1 415 5.0 C#

BDD framework allowing to create easy to read and maintain tests.
snapshooter

7 1 319 4.3 C#

Snapshooter is a snapshot testing tool for .NET Core and .NET Framework
InfluxDB

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Xunit.Gherkin.Quick

8 2 212 4.4 C#

BDD in .NET Core - using Xunit and Gherkin (compatible with both .NET Core and .NET)
fluentassertions.analyzers

9 1 133 7.8 C#

Analyzers based on the FluentAssertions best practices docs
TestExamplesDotnet

10 1 69 9.2 C#

Showing how you can easily setup fast and easy to run more complex tests such as api tests or browser tests in .NET
xRetry

11 0 67 6.9 C#

Retry running tests via xUnit, Specflow and Reqnroll
xunit-dependency-injection

12 1 56 7.2 C#

:fire: A small library to help .NET developers leverage Microsoft's dependency injection framework in their Xunit-powered test projects
tic-tac-toe-csharp-playground

13 2 38 5.1 C#

Another fun project just to update what I know about C# :video_game:
testcontainers-dotnet

14 1 35 3.5 C#

dotnet port of testcontainers-java (by isen-ng)
DbSample

15 1 10 4.7 C#

Example of automated tests against SQL Server with EF Core
EnvironmentDetector

16 1 9 2.7 C#

Library that provides a simple way to detect whether your code is running in a test environment or not. It currently supports detecting MSTest, NUnit, and xUnit test frameworks.
GenWrap

17 1 8 0.0 C#

Open source, source-generated unit testing extensions for .NET
tdd

18 2 7 8.1 C#

Test-Driven Development: A Comprehensive Guide (by aelassas)

Project mention: Test-Driven Development: A Beginner's Guide | dev.to | 2024-10-29

You can find test results on GitHub Actions.
CaptureLogsInUnitTests

19 1 3 0.0 C#

Blog post
SaaSHub

www.saashub.com featured

SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).

C# Xunit discussion

C# Xunit related posts

TDD helper in c#

2 projects | dev.to | 23 Jan 2025
Fluent Assertions 8: Corporate License Update

5 projects | dev.to | 17 Jan 2025
From Bug Fixes to Best Practices: My Open Source Contributions to ChatCraft and xUnit

3 projects | dev.to | 20 Nov 2024
Testcontainers: Testes de Integração em Containers

3 projects | dev.to | 9 Sep 2024
Optimizing C# code analysis for quicker .NET compilation

4 projects | dev.to | 14 Nov 2023
Integration testing in Umbraco 10+: Validating document types

1 project | dev.to | 3 Oct 2023
Comprehensive Unit Testing: A Line-by-Line Approach

2 projects | dev.to | 12 Sep 2023
A note from our sponsor - Stream
getstream.io | 15 Jul 2025

Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure. Learn more →

Index

What are some of the best open-source Xunit projects in C#? This list will help you:

#	Project	Stars
1	xUnit	4,405
2	Cake	4,034
3	Fluent Assertions	3,808
4	AutoFixture	3,470
5	bUnit	1,230
6	LightBDD	415
7	snapshooter	319
8	Xunit.Gherkin.Quick	212
9	fluentassertions.analyzers	133
10	TestExamplesDotnet	69
11	xRetry	67
12	xunit-dependency-injection	56
13	tic-tac-toe-csharp-playground	38
14	testcontainers-dotnet	35
15	DbSample	10
16	EnvironmentDetector	9
17	GenWrap	8
18	tdd	7
19	CaptureLogsInUnitTests	3