junit java test

ReflectionUtils.java

private ItemGroupTransfer itemGroupTransfer;
@Before
public void setUp() {
    businessData = SupportTest.getBusinessData();
    itemGroupTransfer = new ItemGroupTransfer(
            correlativeServiceStub, apiConnectorMock, saleInformationRepositoryMock);
    ReflectionTestUtils.setField(itemGroupTransfer, "refundIgvConnector", refundIgvConnector);
    ReflectionTestUtils.setField(itemGroupTransfer, "contractService", contractService);
    ReflectionTestUtils.setField(itemGroupTransfer, "zMerxService", zMerxService);
    ReflectionTestUtils.setField(itemGroupTransfer, "itemService", itemServiceMock);
}