如何对属性更改的事件进行单元测试

Question

我有一个允许我处理属性事件的服务（它会在 StartDateTime 更改时触发），我想知道如何对该服务进行单元测试，或者如何开始对该属性更改进行单元测试。我必须模拟此服务吗？

[Export(typeof(IDriveTimeService))]
public class DriveTimeService : IDriveTimeService
{
    public void Initialize(IHasDriveTimes target)
    {
        var _driveTimeService = new DriveTimeService ();
        new DriveTimesManager(target);
    }
}

DriveTimesManager

public DriveTimesManager(IHasDriveTimes target)
{
    if (target != null)
    {
        target.PropertyChanged += HandleDriveTimesChanged;
    }
}

private void HandleDriveTimesChanged(object sender, PropertyChangedEventArgs e)
{
    var driveTimes = sender as IHasDriveTimes;
    if (driveTimes != null)
    {
        if (e.PropertyName == driveTimes.GetPropertyName(t => t.StartDateTime))
        {
            driveTimes.StopDateTime += driveTimes.StartDateTime - _previousStartDateTime;
            _previousStartDateTime = driveTimes.StartDateTime;
        }

    }
}

编辑：这是我试过的方法，但我仍然不知道如何测试 StartDateTime 是否被调用

[TestClass]
public class DriveTimeServiceTest
{
    [TestMethod]
    public void DriveTimeServiceNullTest()
    {
        var driveTimeService = new DriveTimeService();


        driveTimeService.Initialize(null);                
        Assert.IsNotNull(driveTimeService);
    }

    [TestMethod]
    public void DriveTimeManagerTest()
    {
        var propertyName = "";
        var mock = new Mock<IHasDriveTimes>();
        DriveTimesManager manager = new DriveTimesManager(mock.Object);

        var change = new PropertyChangedEventArgs(propertyName);
        mock.Verify(m => m.StartDateTime);
        mock.Verify(m => m.StopDateTime);

        manager.HandleDriveTimesChanged(manager, change);

    }

}

Answer 1

我得到了帮助并找到了解决方案。我需要的是在我的构造函数中模拟接口，然后我可以设置那个模拟

var driveTimeService = new DriveTimeService();
        var mock = new Mock<IHasDriveTimes>().SetupAllProperties();
        mock.Object.StartDateTime = DateTimeOffset.Now.Date;
        mock.Object.StopDateTime = mock.Object.StartDateTime + TimeSpan.FromHours(2);
        driveTimeService.Initialize(mock.Object);

        mock.Object.StartDateTime += TimeSpan.FromHours(1);
        mock.Raise(t => t.PropertyChanged += It.IsAny<PropertyChangedEventHandler>(), new PropertyChangedEventArgs(mock.Object.GetPropertyName(t => t.StartDateTime)));

        Assert.AreEqual(mock.Object.StartDateTime + TimeSpan.FromHours(2), mock.Object.StopDateTime);

如何对属性更改的事件进行单元测试

How to unit test a property changed event

c#

unit-testing

inotifypropertychanged

如何对 属性 更改的事件进行单元测试

How to unit test a property changed event

c#

unit-testing

inotifypropertychanged

如何对属性更改的事件进行单元测试