Failing Spring unit test is generated (possibly due to incorrect injection)

[EgorkaKulikov]

To Reproduce

Consider generating unit tests for project spring-boot-testing with modified OrderService class.

@Service
public class OrderService {

    @Autowired
    private OrderRepository orderRepository;

    private List<Order> baseOrders = new ArrayList<>();

    public int getOrdersCount() { return orderRepository.findAll().size() + baseOrders.size(); }
}

Expected behavior

Happy pass test is generated with correct assertions.

Actual behavior

The following failing test is generated.
It fails because real number of items in collection is 3, not 6.

@Test
    @DisplayName("getOrdersCount: OrderRepositoryFindAll -> return orderRepository.findAll().size() + baseOrders.size()")
    public void testGetOrdersCount_ListSize() {
        ArrayList arrayList1 = new ArrayList();
        arrayList1.add(null);
        arrayList1.add(null);
        arrayList1.add(null);
        (when(orderRepositoryMock.findAll())).thenReturn(arrayList1);

        int actual = orderService.getOrdersCount();

        assertEquals(6, actual);
    }

[EgorkaKulikov]

It really seems to be the Spring injection problem. I created the similar project without Spring

public class Order {
    public String name;
}

public class Repository {
    public List<Order> findAll() {
        return new ArrayList<>();
    }
}

public class Service {

    private Repository repo;
    private List<Order> baseOrders = new ArrayList<>();

    public Service(Repository repo) {
        this.repo = repo;
    }

    public int getOrdersSize() {
        return repo.findAll().size() + baseOrders.size();
    }
}

The test we generated has the following form:

@Test(description = "getOrdersSize: RepositoryFindAll -> return repo.findAll().size() + baseOrders.size()")
    public void testGetOrdersSize_ListSize() throws Exception {
        Service service = ((Service) createInstance("Service"));
        Repository repositoryMock = mock(Repository.class);
        ArrayList arrayList = new ArrayList();
        arrayList.add(null);
        arrayList.add(null);
        arrayList.add(null);
        (when(repositoryMock.findAll())).thenReturn(arrayList);
        setField(service, "Service", "repo", repositoryMock);
        setField(service, "Service", "baseOrders", arrayList);

        int actual = service.getOrdersSize();

        assertEquals(actual, 6);
    }

Keep in mind the following line:

setField(service, "Service", "baseOrders", arrayList);

Something like this is lost in our Spring test generation approach.