[KAFKA-9439] Add more public API tests for KafkaProducer

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.7.0
• Labels: newbie
• Assignee: Jeff Kim
• Reporter: Boyang Chen
• Reviewer: Boyang Chen
• Created: 15/Jan/20 19:46
• Updated: 24/Jun/20 19:35
• Resolved: 24/Jun/20 19:34

Description

While working on KIP-447, we realized a lack of test coverage on the KafkaProducer public APIs. For example, `commitTransaction` and `sendOffsetsToTransaction` are not even called in the `KafkaProducerTest.java` and the code coverage is only 75%. 

Adding more unit tests here will be pretty valuable.

Issue Links

• links to: GitHub Pull Request #8174