mimaison commented on a change in pull request #11691:
URL: https://github.com/apache/kafka/pull/11691#discussion_r794665144



##########
File path: 
clients/src/test/java/org/apache/kafka/clients/producer/KafkaProducerTest.java
##########
@@ -514,18 +635,21 @@ public void testMetadataFetch() throws 
InterruptedException {
         producer.close(Duration.ofMillis(0));
     }
 
-    @Test
-    public void testMetadataExpiry() throws InterruptedException {
+    @ParameterizedTest
+    @ValueSource(booleans = {true, false})
+    public void testMetadataExpiry(boolean isIdempotenceEnabled) throws 
InterruptedException {
         Map<String, Object> configs = new HashMap<>();
         configs.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9999");
+        configs.put(ProducerConfig.ENABLE_IDEMPOTENCE_CONFIG, 
isIdempotenceEnabled);
         ProducerMetadata metadata = mock(ProducerMetadata.class);
 
         Cluster emptyCluster = new Cluster(
             "dummy",
-            Collections.singletonList(host1),
+            Collections.singletonList(NODE),

Review comment:
       I was about to suggest using `nodes` here but can't we even completely 
remove `emptyCluster`? There is already a field with the same name and value.




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