C0urante commented on a change in pull request #11777:
URL: https://github.com/apache/kafka/pull/11777#discussion_r817287679



##########
File path: 
clients/src/test/java/org/apache/kafka/clients/admin/KafkaAdminClientTest.java
##########
@@ -6281,6 +6284,30 @@ public void 
testClientSideTimeoutAfterFailureToReceiveResponse() throws Exceptio
         }
     }
 
+    @Test
+    public void testFenceProducers() throws Exception {
+        try (AdminClientUnitTestEnv env = mockClientEnv()) {
+            String transactionalId = "copyCat";
+            Node transactionCoordinator = 
env.cluster().nodes().iterator().next();
+
+            
env.kafkaClient().prepareResponse(prepareFindCoordinatorResponse(Errors.NONE, 
transactionalId, transactionCoordinator));
+
+            InitProducerIdResponseData initProducerIdResponseData = new 
InitProducerIdResponseData()
+                    .setProducerId(4761)
+                    .setProducerEpoch((short) 489);
+            env.kafkaClient().prepareResponseFrom(
+                    request -> request instanceof InitProducerIdRequest,
+                    new InitProducerIdResponse(initProducerIdResponseData),
+                    transactionCoordinator
+            );
+
+            FenceProducersResult result = 
env.adminClient().fenceProducers(Collections.singleton(transactionalId));
+            assertNull(result.all().get());
+            assertEquals(4761, result.producerId(transactionalId).get());
+            assertEquals((short) 489, result.epochId(transactionalId).get());
+        }
+    }
+

Review comment:
       Good call--will add those to the test case, as well as 
`COORDINATOR_LOAD_IN_PROGRESS`.




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