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Rejected Alternatives

• This is will replace replacing KIP-456: Helper classes to make it simpler to write test logic with TopologyTestDriver if accepted
• Deprecate current TestTopologyDriver and move new to test package. This would have enabled to keep also TestInputTopic and TestOutputTopic classes in test package, not in very crowded streams root package.
• Add ClientRecord interface to client package and modifiy ProducerRecord (and / or ConsumerRecord) to implement it, to be to utilize OutputVerifier with ProducerRecord and TestRecord

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