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Top 17 C# testing-tool Projects
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ReSharper
ReSharper is now available in VS Code and Cursor. ReSharper brings a professional toolset for C# developers backed by over 20 years of experience, enterprise-grade security, SOC 2 compliance, and the trust of companies worldwide.
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coyote
Coyote is a library and tool for testing concurrent C# code and deterministically reproducing bugs.
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MSTest
This repository holds the source code of Microsoft.Testing.Platform (MTP), a lightweight alternative to VSTest, as well as MSTest adapter and framework. (by microsoft)
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vstest
Visual Studio Test Platform is the runner and engine that powers test explorer and vstest.console.
These problems seem to stem from the fact that xUnit v3 uses the new Microsoft Test Platform (MTP) which is a replacement for the older VS Test platform, but C# Dev Kit extension in VS Code - which is responsible for discovering tests in a C# test project and providing these to the Test Explorer window - does not work properly with MTP (yet!).
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SaaSHub
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gdUnit4Net
Official C# implementation of GDUnit4 - a comprehensive unit testing framework for Godot 4. Features VS/Rider test adapter integration, parameterized tests, scene runners, and extensive assertion methods.
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AppTestStudio
A visual GUI automation framework for Windows and emulators. Design event-driven workflows with pixel/color matching, precise timing, and multi-instance orchestration. No-code mouse/keyboard input simulation for interactive testing.
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graphql-to-karate
Automagically generate Karate API tests from your GraphQL schemas. Useful for test-driven development, change validation in CI/CD, and more.
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RandomValuesNPP
Generate random values plug-in for Notepad++. Use this plugin to generate passwords, guids or random datasets in CSV, JSON, XML and SQL formats. Use the fake test data for performance and QA testing to improve software quality in application development, reports, database modeling, webdev etc.
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SaaSHub
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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# testing-tools discussion
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A note from our sponsor - SaaSHub
www.saashub.com | 19 Jul 2026
Index
What are some of the best open-source testing-tool projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | FlaUI | 3,050 |
| 2 | NSubstitute | 2,962 |
| 3 | coyote | 1,587 |
| 4 | MSTest | 1,033 |
| 5 | vstest | 965 |
| 6 | Pororoca | 660 |
| 7 | PSRule | 468 |
| 8 | FintX | 258 |
| 9 | skunit | 178 |
| 10 | gdUnit4Net | 173 |
| 11 | AppTestStudio | 36 |
| 12 | ReassureTest.Net | 28 |
| 13 | graphql-to-karate | 17 |
| 14 | RandomValuesNPP | 16 |
| 15 | qest | 9 |
| 16 | vs-clove-unit | 1 |
| 17 | Leet | 0 |
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ReSharper is now available in VS Code and Cursor
ReSharper brings a professional toolset for C# developers backed by over 20 years of experience, enterprise-grade security, SOC 2 compliance, and the trust of companies worldwide.
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