AutoFixture AutoMoq不使用我的模拟属性

Question

我有一个抽象的类，我想测试。这个类中有一个用于我的DAO的抽象属性，我在继承的类中定义了这个属性。

public abstract class DeviceGroupManagerBase<TDeviceGroup> where TDeviceGroup : DeviceGroup 
{
    protected abstract IDeviceGroupDao<TDeviceGroup> DeviceGroupDao { get; }

    public TDeviceGroup UpdateDeviceIndexes(Device device)
    {
        return DeviceGroupDao.GetDeviceGroup(device.Group.Id);
    }
}

我想测试Updatedeviceindexes方法，所以我尝试模拟一个名为DeviceGroupDao的属性。

[TestFixture]
[Category("Unit")]
public class DeviceGroupManagerBaseTests
{
    private IFixture fixture;
    private Mock<DeviceGroupManagerBase<DeviceGroup>> subject;
    private Mock<IDeviceGroupDao<DeviceGroup>> deviceGroupDaoMock;
    private DeviceGroupManagerBase<DeviceGroup> Manager => subject.Object;

    [TestFixtureSetUp]
    public void Init()
    {
        fixture = new Fixture().Customize(new AutoMoqCustomization());
        deviceGroupDaoMock = fixture.Freeze<Mock<IDeviceGroupDao<DeviceGroup>>>();
        subject = fixture.Freeze<Mock<DeviceGroupManagerBase<DeviceGroup>>>();
    }

    [Test]
    public void TestUpdateDeviceIndexes()
    {
        var device = fixture.Create<Device>();
        var deviceGroup = fixture.Create<DeviceGroup>();

        deviceGroupDaoMock.Setup(x => x.GetDeviceGroup(It.IsAny<int>())).Returns(deviceGroup);

        var result = Manager.UpdateDeviceIndexes(device);
        // The resultDeviceGroup will not be contain a previously defined object

        Assert.AreEqual(deviceGroup.Id, result.Id);
    }
}

我还试图以这种方式为我的设备对象添加注册：

fixture.Register(() => deviceGroup);

但我还在买新的东西。

我怎么能模仿IDeviceGroupDao<TDeviceGroup>

Answer 1

因为DeviceGroupManagerBase是一个抽象基类，所以需要一个SUT双。如果您将DeviceGroupDao属性设置为public，那么这是最简单的

public abstract class DeviceGroupManagerBase<TDeviceGroup> where TDeviceGroup : DeviceGroup
{
    public abstract IDeviceGroupDao<TDeviceGroup> DeviceGroupDao { get; }

    public TDeviceGroup UpdateDeviceIndexes(Device device)
    {
        return DeviceGroupDao.GetDeviceGroup(device.Group.Id);
    }
}

否则，您将需要使用Moq的API来定义和覆盖protected成员，这是可能的，但需要做更多的工作。

然后，您需要覆盖subject的DeviceGroupDao属性：

subject.SetupGet(x => x.DeviceGroupDao).Returns(deviceGroupDaoMock.Object);

下面是完整的测试：

[TestFixture]
[Category("Unit")]
public class DeviceGroupManagerBaseTests
{
    private IFixture fixture;
    private Mock<DeviceGroupManagerBase<DeviceGroup>> subject;
    private Mock<IDeviceGroupDao<DeviceGroup>> deviceGroupDaoMock;
    private DeviceGroupManagerBase<DeviceGroup> Manager => subject.Object;

    [OneTimeSetUp]
    public void Init()
    {
        fixture = new Fixture().Customize(new AutoMoqCustomization());
        deviceGroupDaoMock = fixture.Freeze<Mock<IDeviceGroupDao<DeviceGroup>>>();
        subject = fixture.Freeze<Mock<DeviceGroupManagerBase<DeviceGroup>>>();
        subject.SetupGet(x => x.DeviceGroupDao).Returns(deviceGroupDaoMock.Object);
    }

    [Test]
    public void TestUpdateDeviceIndexes()
    {
        var device = fixture.Create<Device>();
        var deviceGroup = fixture.Create<DeviceGroup>();

        deviceGroupDaoMock.Setup(x => x.GetDeviceGroup(It.IsAny<int>())).Returns(deviceGroup);

        var result = Manager.UpdateDeviceIndexes(device);

        Assert.AreEqual(deviceGroup.Id, result.Id);
    }
}

这东西现在传到我的机器上了。

Answer 2

由于DeviceGroupDao是受保护的，所以您需要找到一种外部访问它的方法。创建一个存根，允许您设置它的值。

public class DeviceGroupManagerBaseStub<TDeviceGroup> 
    : DeviceGroupManagerBase<TDeviceGroup> where TDeviceGroup : DeviceGroup {

    private IDeviceGroupDao<TDeviceGroup> deviceGroupDao;

    public DeviceGroupManagerBaseStub(IDeviceGroupDao<TDeviceGroup> deviceGroupDao) {
        this.deviceGroupDao = deviceGroupDao;
    }

    protected override IDeviceGroupDao<TDeviceGroup> DeviceGroupDao {
        get {
            return deviceGroupDao;
        }
    }
}

然后，您可以模拟IDeviceGroupDao<TDeviceGroup>并将其插入到存根中进行测试。