Injecting a stub or mock db context object for integration tests would be 
quite hard with this approach. 

I wonder how di frameworks like spring and guice deal with this issue. The 
application context (spring speech) should be also an actor system related 
singleton and not a global object.  I saw some code examples with global 
init functions like:

object MyExt extends ExtensionId{
  var mySingleton: MySingleton = _

  def init(mySingleton: MySingelton){
    this.mySingleton = mySingleton
  }
}

Especially for testing - where I create actor systems en gross - this 
couldn't be the right pattern?
Leslie 

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