add unit test

Author: leonardBang

flink-cdc-connect/flink-cdc-pipeline-connectors/flink-cdc-pipeline-connector-mysql/src/test/java/org/apache/flink/cdc/connectors/mysql/source/MySqlDataSourceFactoryTest.java

@@ -247,6 +247,7 @@ public void testUnsupportedOption() {
 
     @Test
     public void testOptionalOption() {
+        inventoryDatabase.createAndInitialize();
         Map<String, String> options = new HashMap<>();
         options.put(HOSTNAME.key(), MYSQL_CONTAINER.getHost());
         options.put(PORT.key(), String.valueOf(MYSQL_CONTAINER.getDatabasePort()));