dajac commented on code in PR #13231:
URL: https://github.com/apache/kafka/pull/13231#discussion_r1128091331


##########
core/src/test/scala/unit/kafka/server/KafkaApisTest.scala:
##########
@@ -2030,13 +2032,87 @@ class KafkaApisTest {
       val response = capturedResponse.getValue
 
       if (version < 2) {
-        assertEquals(Collections.singletonMap(topicPartition, 
Errors.INVALID_PRODUCER_EPOCH), response.errors())
+        assertEquals(Collections.singletonMap(topicPartition, 
Errors.INVALID_PRODUCER_EPOCH), 
response.errors().get(AddPartitionsToTxnResponse.V3_AND_BELOW_TXN_ID))
       } else {
-        assertEquals(Collections.singletonMap(topicPartition, 
Errors.PRODUCER_FENCED), response.errors())
+        assertEquals(Collections.singletonMap(topicPartition, 
Errors.PRODUCER_FENCED), 
response.errors().get(AddPartitionsToTxnResponse.V3_AND_BELOW_TXN_ID))
       }
     }
   }
 
+  @Test
+  def testBatchedAddPartitionsToTxnRequest(): Unit = {

Review Comment:
   As a follow-up: It seems that the test coverage is pretty low for this API 
here. It would be great if we could extend it. e.g. authorization failures, 
validation failures, etc.



##########
core/src/test/scala/integration/kafka/api/AuthorizerIntegrationTest.scala:
##########
@@ -231,7 +231,7 @@ class AuthorizerIntegrationTest extends BaseRequestTest {
       resp.errors.get(new ConfigResource(ConfigResource.Type.TOPIC, 
tp.topic)).error),
     ApiKeys.INIT_PRODUCER_ID -> ((resp: InitProducerIdResponse) => resp.error),
     ApiKeys.WRITE_TXN_MARKERS -> ((resp: WriteTxnMarkersResponse) => 
resp.errorsByProducerId.get(producerId).get(tp)),
-    ApiKeys.ADD_PARTITIONS_TO_TXN -> ((resp: AddPartitionsToTxnResponse) => 
resp.errors.get(tp)),
+    ApiKeys.ADD_PARTITIONS_TO_TXN -> ((resp: AddPartitionsToTxnResponse) => 
resp.errors.get(AddPartitionsToTxnResponse.V3_AND_BELOW_TXN_ID).get(tp)),

Review Comment:
   As a follow-up: We should cover the new version here as well.



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