fluentassertions 

FluentAssertions The ID prefix of this package has been reserved for one of the owners of this package by NuGet.org. by: dennisdoomen 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. Targets .NET Framework 4.7, .NET Core 2.1 and 3.0, .NET 6, as well as .NET Standard 2.0 and 2.1. Supports the unit test frameworks MSTest2, NUnit3,... More information