ruanhang1993 commented on a change in pull request #17601:
URL: https://github.com/apache/flink/pull/17601#discussion_r779320247



##########
File path: 
flink-connectors/flink-connector-kafka/src/test/java/org/apache/flink/streaming/connectors/kafka/table/KafkaDynamicTableFactoryTest.java
##########
@@ -380,6 +381,44 @@ public void testTableSourceCommitOnCheckpointDisabled() {
                                 .noDefaultValue()));
     }
 
+    @Test
+    public void testTableSourceSetOffsetReset() {
+        testSetOffsetResetForStartFromGroupOffsets(null);
+        testSetOffsetResetForStartFromGroupOffsets("none");
+        testSetOffsetResetForStartFromGroupOffsets("earliest");
+        testSetOffsetResetForStartFromGroupOffsets("latest");
+    }
+
+    private void testSetOffsetResetForStartFromGroupOffsets(String value) {
+        final Map<String, String> modifiedOptions =
+                getModifiedOptions(
+                        getBasicSourceOptions(),
+                        options -> {
+                            options.remove("scan.startup.mode");
+                            if (value != null) {

Review comment:
       The properties for the Kafka client are not from fixed table options. So 
we have no way to set a default value. And we have to test the null value.




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