patrik-marton commented on code in PR #17815:
URL: https://github.com/apache/kafka/pull/17815#discussion_r1860214955


##########
connect/mirror-client/src/test/java/org/apache/kafka/connect/mirror/ReplicationPolicyTest.java:
##########
@@ -38,15 +38,19 @@ public void setUp() {
 
     @Test
     public void testInternalTopic() {
+        Map<String, Object> config =  new HashMap<>();
+        config.put(MirrorClientConfig.REPLICATION_POLICY_SEPARATOR, ".");
+        DEFAULT_REPLICATION_POLICY.configure(config);
+
         // starts with '__'
         
assertTrue(DEFAULT_REPLICATION_POLICY.isInternalTopic("__consumer_offsets"));
         // starts with '.'
         assertTrue(DEFAULT_REPLICATION_POLICY.isInternalTopic(".hiddentopic"));
 
-        // ends with '.internal': default 
DistributedConfig.OFFSET_STORAGE_TOPIC_CONFIG in standalone mode.
+        // starts with 'mm2' and ends with '.internal': default 
DistributedConfig.OFFSET_STORAGE_TOPIC_CONFIG in standalone mode.
         
assertTrue(DEFAULT_REPLICATION_POLICY.isInternalTopic("mm2-offsets.CLUSTER.internal"));
-        // ends with '-internal'
-        
assertTrue(DEFAULT_REPLICATION_POLICY.isInternalTopic("mm2-offsets-CLUSTER-internal"));
+        // starts with 'mm2' and ends with '-internal'

Review Comment:
   My initial idea was that since we changed the behavior and removed the 
"-internal" prefix from the regex, a test showing that it is not considered an 
internal topic anymore would be nice, but you're right that it is basically the 
same as the non-internal test, so in that sense this can be removed.



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