chia7712 commented on code in PR #18727:
URL: https://github.com/apache/kafka/pull/18727#discussion_r1937725987


##########
core/src/test/scala/unit/kafka/server/ProduceRequestTest.scala:
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@@ -283,6 +286,48 @@ class ProduceRequestTest extends BaseRequestTest {
     assertEquals(-1, partitionProduceResponse1.logAppendTimeMs)
   }
 
+  /**
+   * See `ApiKeys.PRODUCE_OLDEST_VERSION` for the details of why we need 
special handling for produce request v0-v2 (inclusive).
+   */
+  @Test
+  def testProduceRequestV0ToV2IsRejectedByBroker(): Unit = {

Review Comment:
   It seems the primary purpose of retaining v0-v2 is to facilitate easier test 
writing. Perhaps we could create a `LegacyProduceRequest` json that mirrors the 
v0-v2 format exclusively for testing purposes?



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