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FluentAssertions

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. Works with .NET Standard 2.0 and higher, .NET Framework 4.7 and higher and .NET 6 and higher. Supports the unit test frameworks MSTest2, MSTest3, MSTest4, NUnit3, NUnit4, XUnit2, XUnit3, MSpec and TUnit. IMPORTANT: This version is free for open-source projects and non-commercial use, but commercial use requires [a paid license](https://xceed.com/products/unit-testing/fluent-assertions/). Check out the [license page](LICENSE) for more information.

Total Downloads
728.6M
728,551,120
Published
May 12, 2026
Latest stable version

Install

.NET CLI
dotnet add package FluentAssertions --version 8.10.0
Package Manager Console
Install-Package FluentAssertions -Version 8.10.0
PackageReference
<PackageReference Include="FluentAssertions" Version="8.10.0" />

Frameworks

.NETFramework4.7 net6.0 .NETStandard2.0 .NETStandard2.1

Dependencies

[4.5.4, )
[4.5.4, )