liuml07 commented on code in PR #136:
URL: 
https://github.com/apache/flink-connector-kafka/pull/136#discussion_r1855013412


##########
flink-connector-kafka/src/test/java/org/apache/flink/connector/kafka/source/KafkaSourceBuilderTest.java:
##########
@@ -217,6 +217,29 @@ public void testSettingInvalidCustomDeserializers(
                 .hasMessageContaining(expectedError);
     }
 
+    @Test
+    public void testDefaultPartitionDiscovery() {
+        final KafkaSource<String> kafkaSource = getBasicBuilder().build();
+        // Commit on checkpoint and auto commit should be disabled because 
group.id is not specified
+        assertThat(
+                        kafkaSource
+                                .getConfiguration()
+                                
.get(KafkaSourceOptions.PARTITION_DISCOVERY_INTERVAL_MS))
+                
.isEqualTo(KafkaSourceOptions.PARTITION_DISCOVERY_INTERVAL_MS.defaultValue());
+    }
+
+    @Test
+    public void testPeriodPartitionDiscovery() {

Review Comment:
   This newly added test is to avoid regressions for bounded source.



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