@Test
public void getRequiredExtensionsInput3ExtensionsExpect3InList() {

  WorkflowOperationInstance operation = EasyMock.createMock(WorkflowOperationInstance.class);
  EasyMock.expect(operation.getConfiguration("required-extensions")).andReturn("mp4,mov,m4a");
  EasyMock.replay(operation);
  PartialImportWorkflowOperationHandler handler = new PartialImportWorkflowOperationHandler();
  List<String> result = handler.getRequiredExtensions(operation);
  assertEquals("There should be 3 required extensions", 3, result.size());
}