我正在 中编写单元测试WPF 与 起订量 测试用户是否点击了 YesNoCancel
上的"is"按钮MessageBox 当他们关闭窗口时。在我的 CloseCommand
当用户关闭窗口时,我的 ViewModel 中会给出以下消息:
var result = _messageSvc.Show(
"Do you want to save changes?",
"Save Changes",
Services.MessageBoxButton.YesNoCancel,
Services.MessageBoxIcon.Question,
Services.MessageBoxResult.Yes);
我的
_messageSvc
是自定义消息服务内部的私有(private)实例,用于显示消息框。这是该服务的代码:public interface IMessageSvc
{
void Show(string message);
MessageBoxResult Show(string message, string caption, MessageBoxButton buttons, MessageBoxIcon icon, MessageBoxResult defaultResult = 0);
}
public class MessageSvc : IMessageSvc
{
public void Show(string message)
{
MessageBox.Show(message);
}
public MessageBoxResult Show(string message, string caption, MessageBoxButton buttons, MessageBoxIcon icon, MessageBoxResult defaultResult)
{
return (MessageBoxResult)MessageBox.Show(message, caption, (System.Windows.MessageBoxButton)buttons, (System.Windows.MessageBoxImage)icon, (System.Windows.MessageBoxResult)defaultResult);
}
}
注:
MessageBoxButton
, MessageBoxIcon
, 和 MessageBoxResult
是我在同一个文件中进行的枚举,以模仿 .NET 开箱即用的功能。为了可读性,我没有在这里展示它们我的单元测试是:
[TestMethod]
public void ShouldAskToSaveOnCloseRespondYesTest()
{
// Mock and setup initial user data
var u= new User
{
UserId = 1,
UserName = "FirstName LastName",
FavoriteColor = "Blue"
};
mainViewModel.UserInfo= new UserInfoDtoWrapper(u);
// assert the data has not changed yet
Assert.IsFalse(mainViewModel.UserInfo.IsChanged);
// change the user data
mainViewModel.UserInfo.UserName= "LastName FirstName";
// assert the data has changed
Assert.IsTrue(mainViewModel.UserInfo.IsChanged);
// execute window closing
mainViewModel.CloseCommand.Execute(new object());
// verify messagebox shows and the 'Yes' button is clicked
// this will then save the changes made to the user instance
var messageBox = new Mock<IMessageSvc>();
messageBox.Setup(x => x.Show(It.Is<string>(y => y == "Do you want to save changes?"),
It.Is<string>(y => y == "Save Changes"),
It.Is<MessageBoxButton>(y => y == MessageBoxButton.YesNoCancel),
It.Is<MessageBoxIcon>(y => y == MessageBoxIcon.Question),
It.Is<MessageBoxResult>(y => y == MessageBoxResult.Yes)))
.Returns(MessageBoxResult.Yes);
messageBox.Verify();
}
错误出现在
messageBox.Verify()
行,但据我所知,我做得正确。我需要获取消息框的返回值来继续测试用户单击"is"按钮后会发生什么,所以我不想使用 Verify
里面有一个 Linq 查询,而不是我需要捕获结果。谢谢
最佳答案
这行不通。您的测试代码中有 2 个问题:
CloseCommand
(假定调用 IMessageSvc.Show
方法),然后才为该服务设置模拟。 要更正这些错误:
这是一个例子:
class MainViewModel
{
private readonly IMessageSvc _messageSvc;
public MainViewModel(IMessageSvc svc)
{
this._messageSvc = svc;
}
}
[TestMethod]
public void ShouldAskToSaveOnCloseRespondYesTest()
{
// Arrange
var messageBox = new Mock<IMessageSvc>();
messageBox.Setup(x => x.Show(It.Is<string>(y => y == "Do you want to save changes?"),
It.Is<string>(y => y == "Save Changes"),
It.Is<MessageBoxButton>(y => y == MessageBoxButton.YesNoCancel),
It.Is<MessageBoxIcon>(y => y == MessageBoxIcon.Question),
It.Is<MessageBoxResult>(y => y == MessageBoxResult.Yes)))
.Returns(MessageBoxResult.Yes)
.Verifiable();
var mainViewModel = new MainViewModel(messageBox.Object);
// Act
mainViewModel.CloseCommand.Execute(new object());
// Assert
messageBox.Verify();
}
关于c# - 以下设置不匹配,使用 Moq 进行 WPF MVVM 单元测试,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45883759/