private void validateModel(BpmnModel model) {
    assertEquals("simpleProcess", model.getMainProcess().getId());
    assertEquals("Simple process", model.getMainProcess().getName());

    FlowElement flowElement = model.getMainProcess().getFlowElement("flow1");
    assertNotNull(flowElement);
    assertTrue(flowElement instanceof SequenceFlow);
    assertEquals("flow1", flowElement.getId());

    flowElement = model.getMainProcess().getFlowElement("catchEvent");
    assertNotNull(flowElement);
    assertTrue(flowElement instanceof IntermediateCatchEvent);
    assertEquals("catchEvent", flowElement.getId());
    IntermediateCatchEvent catchEvent = (IntermediateCatchEvent) flowElement;
    assertTrue(catchEvent.getEventDefinitions().size() == 1);
    EventDefinition eventDefinition = catchEvent.getEventDefinitions().get(0);
    assertTrue(eventDefinition instanceof TimerEventDefinition);
    TimerEventDefinition timerDefinition = (TimerEventDefinition) eventDefinition;
    assertEquals("PT5M", timerDefinition.getTimeDuration());

    flowElement = model.getMainProcess().getFlowElement("flow1Condition");
    assertNotNull(flowElement);
    assertTrue(flowElement instanceof SequenceFlow);
    assertEquals("flow1Condition", flowElement.getId());
    SequenceFlow flow = (SequenceFlow) flowElement;
    assertEquals("${number <= 1}", flow.getConditionExpression());
  }
  protected String getStencilId(FlowElement flowElement) {
    IntermediateCatchEvent catchEvent = (IntermediateCatchEvent) flowElement;
    List<EventDefinition> eventDefinitions = catchEvent.getEventDefinitions();
    if (eventDefinitions.size() != 1) {
      // return timer event as default;
      return STENCIL_EVENT_CATCH_TIMER;
    }

    EventDefinition eventDefinition = eventDefinitions.get(0);
    if (eventDefinition instanceof MessageEventDefinition) {
      return STENCIL_EVENT_CATCH_MESSAGE;
    } else if (eventDefinition instanceof SignalEventDefinition) {
      return STENCIL_EVENT_CATCH_SIGNAL;
    } else {
      return STENCIL_EVENT_CATCH_TIMER;
    }
  }