hachikuji commented on a change in pull request #10974:
URL: https://github.com/apache/kafka/pull/10974#discussion_r664154672



##########
File path: 
tools/src/test/java/org/apache/kafka/tools/TransactionsCommandTest.java
##########
@@ -437,6 +442,536 @@ public void 
testOldBrokerAbortTransactionWithUnknownCoordinatorEpoch(int coordin
         assertNormalExit();
     }
 
+    @Test
+    public void testFindHangingRequiresEitherBrokerIdOrTopic() throws 
Exception {
+        assertCommandFailure(new String[]{
+            "--bootstrap-server",
+            "localhost:9092",
+            "find-hanging"
+        });
+    }
+
+    @Test
+    public void testFindHangingRequiresTopicIfPartitionIsSpecified() throws 
Exception {
+        assertCommandFailure(new String[]{
+            "--bootstrap-server",
+            "localhost:9092",
+            "find-hanging",
+            "--broker-id",
+            "0",
+            "--partition",
+            "5"
+        });
+    }
+
+    private void expectListTransactions(
+        Map<Integer, Collection<TransactionListing>> listingsByBroker
+    ) {
+        expectListTransactions(null, listingsByBroker);

Review comment:
       Yeah, I was trying to deal with the fact that `TransactionsCommand` 
invokes both variants of `listTransactions`. I dealt with it by modifying the 
no-arg call to provide the options explicitly.




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