Hi,
Forgive me if this particular case has been asked and answered many times 
already but my google skills are failing me.

I would like to unit test an actor that gets an image from Amazon S3, 
extracts some metadata and writes it to the database with Slick. I 
understand how to use Akka TestKit to mock and verify the message sending 
but that's not the issue; I want to verify what the actor is actually doing.

My initial approach was to put the database code into a separate class and 
attempt to inject a mock for that close into the actor. However, scalatest, 
scalamock and Akka TestKit appear to conflict and not allow me to define 
the class (I'm not at my dev machine but the error was something about 
withFixture being overridden with the wrong access).
I also attempted this using my (very flawed) understanding of the Cake 
pattern and got tied up in how I might use the companion object with it.

So what's the idiomatic way of doing this? Do I try and put each 
side-effect piece (S3, database, etc.) into a separate actor and use Akka 
TestKit to verify the flows and unit test the side-effects without mocks? 
Or is there a nice example out there I can follow?

Many thanks,
Edward

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