NuGet
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.
assertionsbdd-stylec-sharpfluent-assertionshacktoberfestmstesttddunit-testing
github.com/fluentassertions/fluentassertionsxceed.com/products/unit-testing/fluent-assertions/Dennis Doomen, Jonas Nyrup, Xceed3.8k · 720 forks · 251 contributors
Release cadenceEvery month
Last releaseSep 14, 2026
Open advisories0
Changelog quality67% curated
GitHub Releases, gaps for some releases
Release history SecurityYou're on
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Upgrade guides
Breaking changes and a migration checklist for each major versionFluentAssertions 7 → 87.2.2 → 8.11.0Sep 14, 2026 BreakingBreaking22Security2Platform1New38Changed40Fixed41Other502FluentAssertions 6 → 76.12.2 → 7.2.2Mar 16, 2026 BreakingPlatform1New3Changed4Fixed8Other7FluentAssertions 5 → 65.10.3 → 6.12.2Nov 8, 2024 BreakingBreaking3Platform1Deprecated1New39Changed37Fixed64Other180FluentAssertions 4 → 54.19.4 → 5.10.3Mar 21, 2020 BreakingBreaking16New34Changed8Fixed49Other1FluentAssertions 3 → 43.5.0 → 4.19.4Aug 24, 2017 BreakingBreaking9New37Changed11Fixed29FluentAssertions 2 → 32.2.0 → 3.5.0Aug 2, 2015 UnknownDeprecated1New15Changed8Fixed22Other3FluentAssertions 1 → 21.7.1.1 → 2.2.0Dec 30, 2013 Unknown
VersionChannelDateChangesSecurity
8.11.0 StableSep 14, 2026Security2New7Changed2Fixed4Other188.10.0 youStableMay 12, 2026New1Changed3Fixed1Other148.9.0 StableMar 16, 2026New4Changed4Fixed1Other408.8.0 StableOct 23, 2025New3Changed1Other58.7.2-beta.1 YankedOct 20, 2026No notes published8.7.1 StableOct 2, 2025Fixed28.7.0 StableSep 25, 2025New1Changed1Other108.6.0 StableAug 14, 2025New1Other88.5.0 StableJul 11, 2025New1Fixed1Other48.4.0 StableJun 25, 2025New2Other58.3.0 StableMay 25, 2025Changed2Other68.2.0 StableMar 14, 2025Changed2Fixed3Other18.1.1 StableFeb 21, 2025Fixed1Other18.1.0 StableFeb 20, 2025New1Changed1Fixed2Other258.0.1 StableJan 21, 2025New1Changed4Other118.0.0 StableJan 14, 2025Breaking22Platform1New16Changed20Fixed26Other3548.0.0-rc.2 YankedJan 5, 2025Fixed1Other38.0.0-rc.1 YankedJan 5, 2025Breaking4Fixed2Other438.0.0-alpha.68 YankedOct 20, 2026No notes published8.0.0-alpha.1 YankedDec 2, 2024Breaking1