Java中的单元测试集合

Question

我有一个单元测试，它允许我迭代一个包含车辆列表的Collection对象。在每次迭代中，我想检查车辆是否是automobile的实例。所以我的代码看起来像这样:

public class VehicleChecker {
    protected boolean checkVehicles(Garage garage) {
        for (Vehicle vehicle : garage.getVehicles() {
            if (vehicle instanceof Automobile) return true;
        }
    }
}

所以我写了相应的代码:

@Mock private Garage mockGarage;
@Mock private VehicleCollection mockVehicleCollection;
@Mock private VehicleCollectionIterator mockVehicleCollectionIterator;
@Mock private Vehicle mockVehicle;
@Test
public void testCheckVehicles() {
    VehicleChecker testObject = new vehicleChecker();
    when(mockGarage.getVehicles()).thenReturn(mockVehicleCollection);
    when(mockVehicleCollection.iterator()).thenReturn(mockVehicleCollectionIterator);
    when(mockVehicleCollectionIterator.hasNext()).thenReturn(true).thenReturn(false);
    when(mockVehicleCollectionIterator.next()).thenReturn(mockVehicle);
    boolean result = testObject.checkVehicles(mockGarage);
    verify(mockGarage).getVehicles();
}

验证语句出现问题。根据它的写作方式，考试应该可以通过。然而，当我逐步执行代码时，代码完全跳过了for循环。为什么呢?迭代Collection和迭代ArrayList的方式有什么不同吗?如果是这样，我如何正确地模拟这种交互?

Answer 1

你确定你已经用MockitoAnnotations.initMocks初始化了mock吗?