Fluent Assertions is a fluent, readable, and extensible set of .NET extension methods that allow developers to write more natural and expressive assertions in their unit tests, it provides a fluent, fluent-like API that makes it easy to write assertions in a natural language-like syntax. In the context of ASP.NET, Fluent Assertions can be used in conjunction with test frameworks such as MSTest, xUnit, and NUnit to write more expressive and readable unit tests for the application. It provides advanced features such as support for collection-specific assertions, support for asynchronous code, and support for custom types. It’s a widely used and open source library, it’s very useful to improve code readability and make the test code more expressive.
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