@Test
  public void testGetCoordinatorStreamStoreFactoryWithoutJobCoordinatorSystem() {
    Optional<MetadataStoreFactory> metadataStoreFactory =
        LocalApplicationRunner.getDefaultCoordinatorStreamStoreFactory(new MapConfig());
    assertFalse(metadataStoreFactory.isPresent());
  }
Default metadata store factory should be null if no job coordinator system defined and the default
ZkJobCoordinator is used.
samza-core/src/test/java/org/apache/samza/runtime/TestLocalApplicationRunner.java