I always forget the syntax when verifying that async methods throw a particular exception with FluentAssertions. This post is to help me (and hopefully others) quickly find the solution to this slightly un-intuitive syntax.

I’d like to get this out of the way before I get into my thoughts on this - this is in no way a dig a Jimmy Bogard. He has provided a clear set of guidelines for the usage here. Unfortunately in my experience, many projects don’t follow these guidelines (and don’t get me wrong I’m guilty of violating some in the past myself).