Receive one message from the test actor and assert that it is of the specified type and was sent by the specified sender Wait time is bounded by the given duration if specified. If not specified, wait time is bounded by remaining time for execution of the innermost enclosing 'within' block, if inside a 'within' block; otherwise by the config value "akka.test.single-expect-default".

public T ExpectMsgFrom<T>(
	IActorRef sender,
	Nullable<TimeSpan> duration = null,
	string hint = null
)

member ExpectMsgFrom : 
        sender : IActorRef * 
        ?duration : Nullable<TimeSpan> * 
        ?hint : string 
(* Defaults:
        let _duration = defaultArg duration null
        let _hint = defaultArg hint null
*)
-> 'T