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https://issues.apache.org/jira/browse/KAFKA-5253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16020920#comment-16020920
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Wim Van Leuven commented on KAFKA-5253:
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Can anybody give direction in how to improve the KStreamTestDriver to support
topic patterns?
> KStreamTestDriver must handle streams created with patterns
> -----------------------------------------------------------
>
> Key: KAFKA-5253
> URL: https://issues.apache.org/jira/browse/KAFKA-5253
> Project: Kafka
> Issue Type: Bug
> Components: streams, unit tests
> Affects Versions: 0.10.2.1
> Reporter: Wim Van Leuven
>
> *Context*
> KStreamTestDriver is being used to unit test topologies while developing
> KStreams apps.
> One such topology uses a Pattern to consume from multiple topics at once.
> *Problem*
> The unit test of the topology fails because KStreamTestDriver fails to deal
> with Patterns properly.
> *Example*
> Underneath is a unit test explaining what I understand should happen, but is
> failing.
> Explicitly adding a source topic matching the topic pattern, generates an
> exception as the topology builder explicitly checks overlapping topic names
> and patterns, in any order of adding pattern and topic. So, it is intended
> behaviour.
> {code:java}
> @Test
> public void shouldProcessFromSourcesThatDoMatchThePattern() {
> // -- setup stream pattern
> final KStream<String, String> source =
> builder.stream(Pattern.compile("topic-source-\\d"));
> source.to("topic-sink");
> // -- setup processor to capture results
> final MockProcessorSupplier<String, String> processorSupplier = new
> MockProcessorSupplier<>();
> source.process(processorSupplier);
> // -- add source to stream data from
> //builder.addSource(builder.newName(KStreamImpl.SOURCE_NAME),
> "topic-source-3");
> // -- build test driver
> driver = new KStreamTestDriver(builder);
> driver.setTime(0L);
> // -- test
> driver.process("topic-source-3", "A", "aa");
> // -- validate
> // no exception was thrown
> assertEquals(Utils.mkList("A:aa"), processorSupplier.processed);
> }
> {code}
> *Solution*
> If anybody can help in defining the solution, I can create a pull request for
> this change.
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