yuxiqian commented on code in PR #3707:
URL: https://github.com/apache/flink-cdc/pull/3707#discussion_r2051873897


##########
flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mongodb-cdc/src/test/java/org/apache/flink/cdc/connectors/mongodb/table/MongoDBTableFactoryTest.java:
##########
@@ -280,6 +286,99 @@ void testValidation() {
                 .hasStackTraceContaining("Unsupported options:\n\nunknown");
     }
 
+    @Test
+    public void testCopyExistingPipelineConflictWithIncrementalSnapshotMode() {
+        // test with 'initial.snapshotting.pipeline' configuration
+        try {
+            Map<String, String> properties = getAllOptions();
+            properties.put("scan.incremental.snapshot.enabled", "true");
+            properties.put(
+                    "initial.snapshotting.pipeline", "[{\"$match\": 
{\"closed\": \"false\"}}]");
+
+            createTableSource(SCHEMA, properties);
+        } catch (Throwable t) {
+            Assertions.assertThat(
+                            ExceptionUtils.findThrowableWithMessage(
+                                    t,
+                                    "The 
initial.snapshotting.*/copy.existing.* config only applies to "
+                                            + "Debezium mode, not incremental 
snapshot mode"))
+                    .isPresent();

Review Comment:
   This check will silently pass even if no exceptions are thrown. Favor 
`assertThatThrownBy(...).rootCause().hasMessageContaining(...)`.



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