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StreamJoined.with(Serdes.Integer(), Serdes.String(), Serdes.Testing your code can be painful and tedious, but it greatly increases the quality of your code. Stream2 = builder.stream(topic2, consumed) Have you had a look at the Kafka Streams unit tests ? It's about piping in the data and checking the end result with a mock processor.įor example for the following stream join: stream1 = builder.stream(topic1, consumed) So you'd have to do some copy-pasting into your own code base. However, unless I am mistaken, the integration tests and their tooling are not included in the test utilities artifact of Kafka Streams (i.e., :kafka-streams-test-utils). (For what it's worth, there are further integration tests examples at, which includes tests that also cover Confluent Schema Registry when using Apache Avro as your data format, etc.) A concrete test example for joins is StreamTableJoinIntegrationTest (there are a few join related integration tests) with its parent AbstractJoinIntegrationTest. See the integration tests for Kafka Streams in the Apache Kafka project, where EmbeddedKafkaCluster and IntegrationTestUtils are the center pieces for the tooling. Effectively, this means you are changing your tests from unit tests to integration/system tests: your test will launch a full-fledged Kafka Streams topology that talks to the embedded Kafka cluster that runs on the same machine as your test. What I suggest is to use tests that spin up an embedded Kafka cluster, and then run your tests against that cluster using the "real" Kafka Streams engine (i.e., not the TopologyTestDriver).
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So i've been looking around for a solution for this but cant find any. This can indeed cause problems when trying to test, for example, certain joins because these operations depend on a certain processing order (e.g., in a stream-table join, the table should already have an entry for key 'alice' before a stream-side event for 'alice' arrives, otherwise the join output for the stream-side 'alice' will not include any table-side data). Notably, there are some differences in the processing order of new, incoming events. It seems not to be working.īy design, but unfortunately in your case, the TopologyTestDriver isn't a 100% accurate model of how the Kafka Streams engine works at runtime. I have a topology that does two kstream joins, the problem im facing is when trying to unit test with the TopologyTestDriver sending a couple of ConsumerRecords with pipeInput and then readOutput.