@Test
public void mustBeAbleToUseStatefulMaponcat() throws Exception {
final JavaTestKit probe = new JavaTestKit(system);
final java.lang.Iterable<Integer> input = Arrays.asList(1, 2, 3, 4, 5);
final Source<Integer, NotUsed> ints =
Source.from(input)
.statefulMapConcat(
() -> {
int[] state = new int[] {0};
return (elem) -> {
List<Integer> list = new ArrayList<>(Collections.nCopies(state[0], elem));
state[0] = elem;
return list;
};
});
ints.runFold("", (acc, elem) -> acc + elem, materializer)
.thenAccept(elem -> probe.getRef().tell(elem, ActorRef.noSender()));
probe.expectMsgEquals("2334445555");
}
