junrao commented on code in PR #21114:
URL: https://github.com/apache/kafka/pull/21114#discussion_r2625239939


##########
metadata/src/test/java/org/apache/kafka/controller/PartitionReassignmentReplicasTest.java:
##########
@@ -197,12 +197,80 @@ public void testIsReassignmentInProgress() {
     }
 
     @Test
-    public void 
testDoesNotCompleteReassignmentIfIsrDoesNotHaveAllTargetReplicas() {
+    public void 
testCanCompleteReassignmentIfIsrDoesNotHaveAnExistingTargetReplica() {
         PartitionReassignmentReplicas replicas = new 
PartitionReassignmentReplicas(
-            partitionAssignment(List.of(0, 1, 2)), 
partitionAssignment(List.of(0, 1, 3)));
+                partitionAssignment(List.of(0, 1, 2)), 
partitionAssignment(List.of(0, 1, 3)));
+        assertTrue(replicas.isReassignmentInProgress());
+
+        // Replica 1 is not in sync
+        Optional<PartitionReassignmentReplicas.CompletedReassignment> 
reassignmentOptional =
+                replicas.maybeCompleteReassignment(List.of(0, 2, 3));

Review Comment:
   Should we just use {3} as the target ISR as in the original test?



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