ableegoldman commented on a change in pull request #9174:
URL: https://github.com/apache/kafka/pull/9174#discussion_r470374291



##########
File path: 
streams/test-utils/src/main/java/org/apache/kafka/streams/TopologyTestDriver.java
##########
@@ -805,10 +805,10 @@ public void advanceWallClockTime(final Duration advance) {
 
     private Queue<ProducerRecord<byte[], byte[]>> getRecordsQueue(final String 
topicName) {
         final Queue<ProducerRecord<byte[], byte[]>> outputRecords = 
outputRecordsByTopic.get(topicName);
-        if (outputRecords == null) {
-            if (!processorTopology.sinkTopics().contains(topicName)) {
-                throw new IllegalArgumentException("Unknown topic: " + 
topicName);
-            }
+        if (outputRecords == null && 
!processorTopology.sinkTopics().contains(topicName)) {

Review comment:
       Yeah, that's a good point. Took a quick look at this and personally I 
feel it's not worth it to add even more things for the internal topology to 
track. But it wouldn't really add any complexity so if this is a big concern I 
can go ahead and add in a flag to watch out for any non-static 
TopicNameExtractors




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