Fluent Assertions is a set of .NET extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style test. We currently use it in all our internal and client projects, and it is used in many open-source projects. It runs on .NET 4.0, 4.5, 4.6, CoreClr, .NET Native, Windows 8.1, Silverlight 5, Windows Phone 8.0…
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README.md

"With Fluent Assertions, the assertions look beautiful, natural and most importantly, extremely readable" (by Girish)