Verifying no argument and private methods using Mockito

Question

I am new to JUnit & Mockito, the below class is defined with a method execute which needs to be tested, I wonder is it possible to mock this type of class ? Please shed some light and share your thoughts.

public class MyRule implements SuperRule{    
  private OrderList orderList;
  private ScheduleList scheduleList;

  public MyRule (OrderList orderList, ScheduleList scheduleList) {
    this.orderList = orderList;
    this.scheduleList = scheduleList;
  }

  @Override
  public void execute() {
    createWeeklyClassificationRule(orderList);      
    handle(scheduleList);

  }      
  private void createWeeklyClassificationRule(OrderList orderList) {
   //......
  }      
  private void handle(ScheduleList scheduleList) { 
    //......      
  }
}

Answer 1

You could mock scheduleList and orderList instead and use verify to make sure the correct methods are being called from them.

public class MyRuleTest
{
  private MyRule myRule;
  private ScheduleList scheduleListMock;
  private OrderList orderListMock;

  @Before
  public void setUp() throws Exception
  {
    scheduleListMock = mock(ScheduleList.class);
    orderListMock = mock(OrderList.class);

    myRule = new MyRule(orderListMock, scheduleListMock);
  }

  @Test
  public void testExecute()
  {
    myRule.execute();
    verify(scheduleListMock).foo();
    verify(orderListMock).bar();
  }

...

You would just replace foo and bar with whatever methods you are expecting to be called.

If you are testing MyRule, you shouldn't be mocking it. A good rule of thumb is to not mock the class that is under test.