When trying to have a mocked method raise an event, I'm getting the error message "Expression is not an event add". The interface I'm using is a mess of inheritance and new versions of events, so maybe that's related, but here's a fiddle with a stripped-down version where you can see the error happening.

https://dotnetfiddle.net/kqhOln

Did I do something wrong, or is this a bug?

Thanks.