I can't successfully test my processing application which require EXACTLY_ONCE processing guarantee using the new TopologyTestDriver. I always get the following exception: java.lang.IllegalStateException: MockProducer hasn't been initialized for transactions

The tests all work fine as soon as I set PROCESSING_GUARANTEE_CONFIG to AT_LEAST_ONCE.

Am I doing something wrong?

Kafka developpers can reproduce this by adding:

to line 88 of TopologyTestDriverTest: streams/test-utils/src/test/java/org/apache/kafka/streams/TopologyTestDriverTest.java

Thanks, Fred

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