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There were a few decisions made here that were a little bit beyond just adding this request:
Upgrade the test project to .net core 3.1 since the .net core 2.2 library is not supported by ms anymore. I went to install .net core 2.2, but it was just redirecting me to the latest version. It couldn't run the tests without this change
I refactored the FacebookClient.GetAsync method to be a little more readable since that was the part of the code that took me the longest to understand.
In Facebookclient.SerializeResponse I made it so the actual Facebook error was throw so that error messages are more informative. This was quite helpful for me as I added extra tests.