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.

Papercut SMTP -- The Simple Desktop Email Server

A friendly substitute for .NET mocking libraries.

ReportGenerator converts coverage reports generated by coverlet, OpenCover, dotCover, Visual Studio, NCover, Cobertura, JaCoCo, Clover, gcov or lcov into human readable reports in various formats.

NUnit Framework

Verify is a snapshot tool that simplifies the assertion of complex data models and documents.

UI automation library for .Net

Should testing for .NET—the way assertions should be!

Testing layer for Microsoft's HttpClient library. Create canned responses using a fluent API.

Just like System.Web.Abstractions, but for System.IO. Yay for testable IO access!

Coyote is a library and tool for testing concurrent C# code and deterministically reproducing bugs.

WireMock.Net is a flexible product for stubbing and mocking web HTTP responses using advanced request matching and response templating. Based on the functionality from http:https://WireMock.org, but extended with more functionality.

Replace any .NET method (including static and non-virtual) with a delegate

A curated list of awesome tips and tricks, resources, videos and articles in .net, software architecture, microservice and cloud-native

Visual Studio Test Platform is the runner and engine that powers test explorer and vstest.console.

Mocking Entity Framework Core operations such ToListAsync, FirstOrDefaultAsync etc

Ergonomic Testing for .NET

✅ List of Automated Testing (TDD/BDD/ATDD/SBE) Tools and Frameworks for .NET

C#/.NET test automation framework for web

AFL-based fuzz testing for .NET