I have for many years been a huge proponent of the excellent FluentAssertions library, the work of Dennis Doomen.

There have been developments around the licensing of that library that I discussed here. I also talked about how I found those changes objectionable, and looked at alternatives, finally settling on the library AwesomeAssertions.

This is a community driven fork was a drop in replacement, and you did not need to change your code at all. It also, very importantly, has very good documentation, based on the original work by Dennis.

Until recently, when there was a material change - the renaming of the namespaces.

Previously, the namespace continued to be FluentAssertions.

As of version 9, it is now AwesomeAssertions.

The rationale is explained here, and this is the relevant GitHub issue.

Making this upgrade will break your compile, and you will need to update your code accordingly, which is a trivial, single-line change.

AwesomeAssertionsNamespace

TLDR

The latest version of AwesomeAssertions has a breaking change - renaming of the namespace from FluentAssertions to AwesomeAssertions.