mimaison commented on a change in pull request #10221:
URL: https://github.com/apache/kafka/pull/10221#discussion_r658821310



##########
File path: 
connect/mirror/src/test/java/org/apache/kafka/connect/mirror/MirrorConnectorConfigTest.java
##########
@@ -262,4 +264,65 @@ public void testTargetAdminConfigWithSourcePrefix() {
         assertEquals(expectedAdminProps, connectorAdminProps, prefix + " 
source connector admin props not matching");
     }
 
+    @Test
+    public void testOffsetSyncsTopic() {
+        // Invalid location
+        Map<String, String> connectorProps = 
makeProps("offset-syncs.topic.location", "something");
+        assertThrows(ConfigException.class, () -> new 
MirrorConnectorConfig(connectorProps));
+
+        connectorProps.put("offset-syncs.topic.location", "source");
+        MirrorConnectorConfig config = new 
MirrorConnectorConfig(connectorProps);
+        assertEquals("mm2-offset-syncs.target2.internal", 
config.offsetSyncsTopic());
+        connectorProps.put("offset-syncs.topic.location", "target");
+        config = new MirrorConnectorConfig(connectorProps);
+        assertEquals("mm2-offset-syncs.source1.internal", 
config.offsetSyncsTopic());
+        // Default to source
+        connectorProps.remove("offset-syncs.topic.location");
+        config = new MirrorConnectorConfig(connectorProps);
+        assertEquals("mm2-offset-syncs.target2.internal", 
config.offsetSyncsTopic());
+    }
+
+    @Test
+    public void testConsumerConfigsForOffsetSyncsTopic() {
+        Map<String, String> connectorProps = makeProps(
+                "source.consumer.max.partition.fetch.bytes", "1",
+                "target.consumer.heartbeat.interval.ms", "1",
+                "consumer.max.poll.interval.ms", "1",
+                "fetch.min.bytes", "1"
+        );
+        MirrorConnectorConfig config = new 
MirrorConnectorConfig(connectorProps);
+        assertEquals(config.sourceConsumerConfig(), 
config.offsetSyncsTopicConsumerConfig());
+        connectorProps.put("offset-syncs.topic.location", "target");
+        config = new MirrorConnectorConfig(connectorProps);
+        assertEquals(config.targetConsumerConfig(), 
config.offsetSyncsTopicConsumerConfig());
+    }
+
+    @Test
+    public void testProducerConfigsForOffsetSyncsTopic() {
+        Map<String, String> connectorProps = makeProps(
+                "source.batch.size", "1",
+                "target.acks", "1",
+                "producer.max.poll.interval.ms", "1",
+                "fetch.min.bytes", "1"
+        );
+        MirrorConnectorConfig config = new 
MirrorConnectorConfig(connectorProps);
+        assertEquals(config.sourceProducerConfig(), 
config.offsetSyncsTopicProducerConfig());
+        connectorProps.put("offset-syncs.topic.location", "target");

Review comment:
       Right, I should have seen that this morning when I updated the test just 
above! Thanks




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