nvollmar commented on code in PR #962:
URL: https://github.com/apache/incubator-pekko/pull/962#discussion_r1452722417


##########
stream-testkit/src/main/scala/org/apache/pekko/stream/testkit/StreamTestKit.scala:
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@@ -462,6 +463,16 @@ object TestSubscriber {
       self
     }
 
+    /**
+     * Fluent DSL
+     * Expect the given elements to be signalled in order.
+     * @since 1.1.0
+     */
+    def expectNextN(elems: java.util.List[I]): Self = {

Review Comment:
   `java.util.Set` implements `Iterable` but would not keep the order. In this 
context a `List` would probably make most sense to guide the user.



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