test: HandoverIT-POC - working fix: using `delayElements()`

* Switched from `Flux.flatMap(Mono.delay()..)` to
  `Flux.from(..).delayElements()`FIX:delay_vs_delayElements.
* This delays eache element of the `Flux` by the same amount.
* The requests are made, when the according element of the flux is
  executed - not when the `Flux` is created, as before.

diff --git a/src/test/java/de/juplo/kafka/chat/backend/TestWriter.java b/src/test/java/de/juplo/kafka/chat/backend/TestWriter.java
index 133a768..0d2c41e 100644 (file)
--- a/src/test/java/de/juplo/kafka/chat/backend/TestWriter.java
+++ b/src/test/java/de/juplo/kafka/chat/backend/TestWriter.java
@@ -42,10 +42,10 @@ public class TestWriter
             return i++;
           }
         })
+        .delayElements(Duration.ofMillis(ThreadLocalRandom.current().nextLong(500, 1500)))
         .map(i -> "Message #" + i)
-        .flatMap(message -> Mono
-            .delay(Duration.ofMillis(ThreadLocalRandom.current().nextLong(500, 1500)))
-            .thenMany(sendMessage(chatRoom, message).retryWhen(Retry.fixedDelay(10, Duration.ofSeconds(1)))))
+        .flatMap(message -> sendMessage(chatRoom, message)
+            .retryWhen(Retry.fixedDelay(10, Duration.ofSeconds(1))))
         .doOnNext(message ->
         {
           sentMessages.add(message);