Receive one message of the specified type from the test actor calls the action that performs extra assertions. Use this variant to implement more complicated or conditional processing. Wait time is bounded by the given duration, if specified; otherwise 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 ExpectMsg<T>(
	Action<T, IActorRef> assertMessageAndSender,
	Nullable<TimeSpan> timeout = null,
	string hint = null
)

member ExpectMsg : 
        assertMessageAndSender : Action<'T, IActorRef> * 
        ?timeout : Nullable<TimeSpan> * 
        ?hint : string 
(* Defaults:
        let _timeout = defaultArg timeout null
        let _hint = defaultArg hint null
*)
-> 'T