Colin, the TopologyTestDriver does not connect to any broker and simulates processing of single-partitioned input topics purely in-memory (the driver is basically a mock for a StreamThread). This is sufficient to test basic business logic. For more complex topologies that are actually divided into sub-topologies and connected via topics, the driver detects this case and does an in-memory forward.
-Matthias On 1/16/18 10:08 AM, Colin McCabe wrote: > Thanks, Matthias, this looks great. > > It seems like these APIs could either be used against mock objects, or > against real brokers running in the same process. Is there a way for the > user to select which they want when using the API? Sorry if it's in the KIP > and I missed it. > > cheers, > Colin > > > On Thu, Jan 11, 2018, at 18:06, Matthias J. Sax wrote: >> Dear Kafka community, >> >> I want to propose KIP-247 to add public test utils to the Streams API. >> The goal is to simplify testing of Kafka Streams applications. >> >> Please find details in the wiki: >> https://cwiki.apache.org/confluence/display/KAFKA/KIP-247%3A+Add+public+test+utils+for+Kafka+Streams >> >> This is an initial KIP, and we hope to add more utility functions later. >> Thus, this KIP is not comprehensive but a first step. Of course, we can >> enrich this initial KIP if we think it falls too short. But we should >> not aim to be comprehensive to keep the scope manageable. >> >> In fact, I think we should add some more helpers to simplify result >> verification. I will update the KIP with this asap. Just wanted to start >> the discussion early on. >> >> An initial WIP PR can be found here: >> https://github.com/apache/kafka/pull/4402 >> >> I also included the user-list (please hit "reply-all" to include both >> lists in this KIP discussion). >> >> Thanks a lot. >> >> >> -Matthias >> >> >> Email had 1 attachment: >> + signature.asc >> 1k (application/pgp-signature)
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