[GitHub] [kafka] mjsax commented on a diff in pull request #12608: Enable KStream to be merged with itself

[GitBox <gi...@apache.org>]

mjsax commented on code in PR #12608:
URL: https://github.com/apache/kafka/pull/12608#discussion_r1058585746


##########
streams/src/test/java/org/apache/kafka/streams/kstream/internals/KStreamImplTest.java:
##########
@@ -1694,6 +1694,28 @@ public void shouldMergeMultipleStreams() {
             processorSupplier.theCapturedProcessor().processed());
     }
 
+    @Test
+    public void shouldMergeSameStreams() {
+        final String topic1 = "topic-1";
+
+        final KStream<String, String> source = builder.stream(topic1);
+        final KStream<String, String> merged = source.merge(source);
+
+        merged.process(processorSupplier);
+
+        System.out.println(builder.build().describe());

Review Comment:
   We should not have `println` calls inside tests.



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