jeffkbkim commented on code in PR #16511:
URL: https://github.com/apache/kafka/pull/16511#discussion_r1673128140


##########
group-coordinator/src/test/java/org/apache/kafka/coordinator/group/GroupCoordinatorShardTest.java:
##########
@@ -993,13 +998,50 @@ public void testCleanupGroupMetadata() {
         verify(groupMetadataManager, 
times(0)).maybeDeleteGroup(eq("other-group-id"), any());
     }
 
+    @Test
+    public void testCleanupGroupMetadataWhenAppendFails() {
+        GroupMetadataManager groupMetadataManager = 
mock(GroupMetadataManager.class);
+        OffsetMetadataManager offsetMetadataManager = 
mock(OffsetMetadataManager.class);
+        Time mockTime = new MockTime();
+        MockCoordinatorTimer<Void, CoordinatorRecord> timer = new 
MockCoordinatorTimer<>(mockTime);
+        GroupCoordinatorMetricsShard metricsShard = 
mock(GroupCoordinatorMetricsShard.class);
+        GroupCoordinatorShard coordinator = new GroupCoordinatorShard(
+            new LogContext(),
+            groupMetadataManager,
+            offsetMetadataManager,
+            mockTime,
+            timer,
+            mock(GroupCoordinatorConfig.class),
+            mock(CoordinatorMetrics.class),
+            metricsShard
+        );
+
+        when(groupMetadataManager.groupIds()).thenReturn(mkSet("group-id", 
"other-group-id"));
+        when(offsetMetadataManager.cleanupExpiredOffsets(eq("group-id"), 
eq(new ArrayList<>()))).thenReturn(true);
+        when(groupMetadataManager.maybeDeleteGroup(eq("group-id"), eq(new 
ArrayList<>()))).thenReturn(true);

Review Comment:
   the test above, testCleanupGroupMetadata 
(https://github.com/apache/kafka/pull/16511/files/b73af9c786d4ad29259d0bfeb7c16db3324eff4b#diff-3a0b9cad0253e0f6d4665efd0d6f7efd5bd5dd96d3ba31005cab06fa728aad8fR990)
   
   tests that the records we add are reflected. would this be sufficient?



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