Mocking a List and attempting to iterate over it

Question

Currently using Mockito to Test a method from one of my classes. My class contains a List, and the method takes in an object of the same class. The issue is when I attempt to it

Answer 1

You can't add values to the Mocked element. you can remove @Mock from the list of data and use new keyword to initilize it.

private Shipment shipment;
private Shipment shipment2;
@Mock
private Order mockOrder1;
@Mock
private Order mockOrder2;
@Mock
private Order mockOrder3;

private ArrayList mockShipmentOrders;

private ArrayList mockShipmentOrders2;

@Before
public void setUp(){
    MockitoAnnotations.initMocks(this);
    mockShipmentOrders = new ArrayList<>();
    mockShipmentOrders2 = new ArrayList<>();
    mockShipmentOrders.add(mockOrder1);
    mockShipmentOrders.add(mockOrder2);
    mockShipmentOrders2.add(mockOrder3);
    shipment = new Shipment(1, mockShipmentOrders);
    shipment2 = new Shipment(2, mockShipmentOrders2);
}

@Test
public void test_mergeShipments_increasesByOneWhenAShipmentOfOneAddedToAShipmentORderSizeOfTwo(){
    System.out.println(shipment);
    System.out.println(shipment2);
    shipment.mergeShipments(shipment2);

    assertEquals(3, shipment.getShipmentOrders().size());
}