dongnuo123 commented on code in PR #14408:
URL: https://github.com/apache/kafka/pull/14408#discussion_r1344502310


##########
group-coordinator/src/test/java/org/apache/kafka/coordinator/group/GroupCoordinatorShardTest.java:
##########
@@ -105,11 +119,126 @@ public void testCommitOffset() {
         assertEquals(result, coordinator.commitOffset(context, request));
     }
 
+    @Test
+    public void testDeleteGroups() {
+        GroupMetadataManager groupMetadataManager = 
mock(GroupMetadataManager.class);
+        OffsetMetadataManager offsetMetadataManager = 
mock(OffsetMetadataManager.class);
+        GroupCoordinatorShard coordinator = new GroupCoordinatorShard(
+            new LogContext(),
+            groupMetadataManager,
+            offsetMetadataManager
+        );
+
+        RequestContext context = requestContext(ApiKeys.DELETE_GROUPS);
+        List<String> groupIds = Arrays.asList("group-id-1", "group-id-2");
+        DeleteGroupsResponseData.DeletableGroupResultCollection 
expectedResultCollection = new 
DeleteGroupsResponseData.DeletableGroupResultCollection();
+        List<Record> expectedRecords = new ArrayList<>();
+        for (String groupId : groupIds) {
+            expectedResultCollection.add(new 
DeleteGroupsResponseData.DeletableGroupResult().setGroupId(groupId));
+            expectedRecords.addAll(Arrays.asList(
+                RecordHelpers.newOffsetCommitTombstoneRecord(groupId, 
"topic-name", 0),
+                RecordHelpers.newGroupMetadataTombstoneRecord(groupId)
+            ));
+        }
+
+        
CoordinatorResult<DeleteGroupsResponseData.DeletableGroupResultCollection, 
Record> expectedResult = new CoordinatorResult<>(
+            expectedRecords,
+            expectedResultCollection
+        );
+
+        
doNothing().when(groupMetadataManager).validateDeleteGroup(ArgumentMatchers.anyString());

Review Comment:
   when(method).doSomething requires method to return a non-void value. I can 
add a comment here for explanation.



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