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https://issues.apache.org/jira/browse/KAFKA-3571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15244359#comment-15244359
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Ismael Juma commented on KAFKA-3571:
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I think KIP-4 may be a better way to do this.
> Traits for utilities like ConsumerGroupCommand
> ----------------------------------------------
>
> Key: KAFKA-3571
> URL: https://issues.apache.org/jira/browse/KAFKA-3571
> Project: Kafka
> Issue Type: Improvement
> Components: clients
> Affects Versions: 0.9.0.1
> Reporter: Greg Zoller
> Priority: Minor
>
> I notice that several utilities like ConsumerGroupCommand are implemented
> (hard-wired really) to be command-line utilities. It'd be really handy for
> testing if these were broken out as Scala traits (that don't call println)
> with the concrete classes or objects being the command-line utility.
> As a trait I could create a thin wrapper class passing the same array of
> arguments, and instead of producing screen output the trait could produce
> result classes.
> The command-line utilities (your concrete classes implementing the traits)
> could format screen output from the result classes.
> Why do this? It'd be a really nice way for test code to query things like
> offsets and such after a test run.
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