Github user nickwallen commented on the issue:
https://github.com/apache/metron/pull/1265
> @ottobackwards: Can we test parser chains?
I don't think so at the moment. Aggregation/chaining involves multiple
parsers, each reading/writing data from Kafka. These functions work at the
level of 1 parser and 1 `ParserRunner`. Thanks to @justinleet for my quick
education on the topic.
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