Making fluent assertions in unit testing

FluentAssertions is a set of extension methods that make writing and reading the code in unit tests and the error messages of failing tests more like a natural human language like English.

It works with most unit testing frameworks, including xUnit. When you add a package reference for a test framework, FluentAssertions will automatically find the package and use it to throw exceptions.

After importing the FluentAssertions namespace, call the Should() extension method on a variable and then one of the hundreds of other extension methods to make assertions in a human-readable way. You can chain multiple assertions using the And() extension method or have separate statements, each calling Should().

Making assertions about strings

Let’s start by making assertions about a single string value:

1. Use your preferred code editor to add a new xUnit Test Project / xunit named FluentTests to a Chapter11 solution.
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