rreddy-22 commented on code in PR #15150:
URL: https://github.com/apache/kafka/pull/15150#discussion_r1483624940


##########
clients/src/test/java/org/apache/kafka/clients/admin/KafkaAdminClientTest.java:
##########
@@ -2849,6 +2914,44 @@ public void 
testListConsumerGroupsWithStatesOlderBrokerVersion() throws Exceptio
         }
     }
 
+    @Test
+    public void testListConsumerGroupsWithTypesOlderBrokerVersion() throws 
Exception {
+        ApiVersion listGroupV4 = new ApiVersion()
+            .setApiKey(ApiKeys.LIST_GROUPS.id)
+            .setMinVersion((short) 0)
+            .setMaxVersion((short) 4);
+        try (AdminClientUnitTestEnv env = new 
AdminClientUnitTestEnv(mockCluster(1, 0))) {
+            
env.kafkaClient().setNodeApiVersions(NodeApiVersions.create(Collections.singletonList(listGroupV4)));
+
+            
env.kafkaClient().prepareResponse(prepareMetadataResponse(env.cluster(), 
Errors.NONE));
+
+            // Check if we can list groups with older broker if we don't 
specify types.
+            env.kafkaClient().prepareResponseFrom(
+                new ListGroupsResponse(new ListGroupsResponseData()
+                    .setErrorCode(Errors.NONE.code())
+                    .setGroups(Collections.singletonList(
+                        new ListGroupsResponseData.ListedGroup()
+                            .setGroupId("group-1")
+                            
.setProtocolType(ConsumerProtocol.PROTOCOL_TYPE)))),
+                env.cluster().nodeById(0));
+            ListConsumerGroupsOptions options = new 
ListConsumerGroupsOptions();
+            ListConsumerGroupsResult result = 
env.adminClient().listConsumerGroups(options);
+            Collection<ConsumerGroupListing> listing = result.all().get();
+            assertEquals(1, listing.size());
+            List<ConsumerGroupListing> expected = 
Collections.singletonList(new ConsumerGroupListing("group-1", false));
+            assertEquals(expected, listing);

Review Comment:
   I added the inStates option so we can test with this API version with states 
and without types



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