Receive one message from the test actor and assert that it is equal to the expected value, according to the specified comparer function. 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>(
	T expected,
	Func<T, T, bool> comparer,
	Nullable<TimeSpan> timeout = null,
	string hint = null
)

member ExpectMsg : 
        expected : 'T * 
        comparer : Func<'T, 'T, bool> * 
        ?timeout : Nullable<TimeSpan> * 
        ?hint : string 
(* Defaults:
        let _timeout = defaultArg timeout null
        let _hint = defaultArg hint null
*)
-> 'T