Fluent Assertions
C# library of extension methods for expressing assertions in .NET unit tests, for MSTest, NUnit, xUnit, MSpec and TUnit.
fluentassertions.comrepositorydocspricing
Fluent Assertions is a C# library of extension methods for expressing assertions in .NET unit tests. The homepage names the test frameworks it supports, and the library is installed from NuGet. Dennis Doomen wrote the library first and Jonas Nyrup joined later, and Xceed Software Inc. now supports and maintains it.
Worth knowing
The current major line is free for open-source projects and non-commercial use, and commercial use requires a paid license. The previous major line stays open source under its earlier terms. The product page sells the commercial license as a subscription.
Sources
- 2026-11-08: links, Runtime, License
fluentassertions.com - 2026-11-08: links, Written in, GitHub stars
api.github.com/repos/fluentassertions/fluentassertions - 2026-11-08: links, Categories
fluentassertions.com/introduction - 2026-11-08: Maintainer, Owned by, License
github.com/fluentassertions/fluentassertions/blob/main/LICENSE - 2026-11-08: First release
api.nuget.org/v3/registration5-semver1/fluentassertions/page/1.3.0.1/4.19.3.json - 2026-11-08: Install with
github.com/fluentassertions/fluentassertions/blob/main/README.md - 2026-11-08: links
xceed.com/products/unit-testing/fluent-assertions/ - 2026-11-08: Current major version, Last release
api.github.com/repos/fluentassertions/fluentassertions/releases - 2026-11-08: Contributors
api.github.com/repos/fluentassertions/fluentassertions/contributors?per_page=1 - 2026-11-08: Dependent packages
packages.ecosyste.ms/api/v1/registries/nuget.org/packages/FluentAssertions