我如何测试已收到MVVM指示灯消息并采取措施?
作者:互联网
我有一个派生类,它通过属性注入获取对象并在该对象的Messenger上注册:
public class Foo : AbsFoo
{
private IBar bar;
public override IBar Bar
{
get {return bar;}
set
{
bar = value
if(bar != null)
{
bar.Messenger.Register<MyMessage>(this, m => SomeMethod());
}
}
}
public override void SomeMethod()
{
//..
}
}
基本上,我想设置Bar,发送一条消息,并验证是否调用了SomeMethod().
我的测试看起来像这样:
var fixture = new Fixture();
fixture.Customize(new AutoConfiguredMoqCustomization());
var messenger = new Messenger();
var barFixture = fixture.Create<IBar>();
barFixture.Messenger = messenger
var fooMock = new Mock<Foo> {CallBase = true};
fooMock.SetupAllProperties();
fooMock.Object.Bar = barFixture;
fooMock.VerifySet(s=> s.Bar = It.IsAny<IBar>(),Times.AtLeastOnce()); // Success
messenger.Send(new MyMessage());
fooMock.Verify(c => c.SomeMethod(), Times.Once); // Fails
VerifySet()成功,并且传递了正确的对象(通过调试检查),并且Messenger实例相同.但是Verifyon方法调用失败,我真的不明白为什么.
我不太确定我必须在fooMock上使用的设置方法(Setup?SetupSet?Another?).
解决方法:
删除您的呼叫
fooMock.SetupAllProperties();
这将导致Mock覆盖该属性,并且您的Register方法将永远不会在setter中被调用.
上一行导致永不运行的代码(因为它已覆盖自定义实现)
public override IBar Bar
{
get { return _bar; }
set
{
_bar = value;
_bar?.Messenger.Register<MyMessage>(this, m => SomeMethod());
}
}
因此,您永远不会在Messenger上订阅任何消息.
编辑
对我来说以下工作:
var messenger = new Messenger();
var bar = new Mock<Foo.IBar>();
bar.Setup(x => x.Messenger).Returns(messenger);
var fooMock = new Mock<Foo> { CallBase = true };
//fooMock.SetupAllProperties();
fooMock.Object.Bar = bar.Object;
fooMock.VerifySet(s => s.Bar = It.IsAny<Foo.IBar>(), Times.AtLeastOnce()); // Success
messenger.Send(new Foo.MyMessage());
fooMock.Verify(c => c.SomeMethod(), Times.Once); // Works
在发送消息告诉Moq注册呼叫之前,您可能需要做的一件事是:
fooMock.Setup(x => x.SomeMethod()).Verifiable();
标签:autofixture,unit-testing,moq,mvvm-light,c 来源: https://codeday.me/bug/20191026/1938315.html