Not able to set property on mock-CodePudding

I am trying to set a property on a mock by calling a method on it which sets the property value.

MyObject myObject = new MyObject();
Mock<IMockedClass> myMock = new Mock<IMockedClass>();
myMock.SetupAllProperties();

myMock.Object.MethodWhichSetsProperty(myObject);

Now I am expecting myMock.Object.MyProperty to be set to myObject, but its not since MethodWhichSetsProperty is never actually called when setting a breakpoint in the actual class that was mocked.

I have also tried

myMock.SetupGet(x => x.MyProperty).Returns(myObject);

But the property just returns null when used afterwards.

The class that is being mocked:

public class MockedClass : IMockedClass
    {
        public MyObject MyProperty { get; private set; }
        
        public MockedClass()
        {
            
        }
        
        public void MethodWhichSetProperty(MyObject myObject)
        {
            MyProperty = myObject;
        }
    }

CodePudding user response：

You need to set up MethodWhichSetsProperty for the mocked class.

Something like this should work:

MyObject myObject = new MyObject();
myMock.SetupGet(x => x.MyProperty).Returns(myObject);
myMock.Setup(x => x.MethodWhichSetsProperty(It.IsAny<MyObject>())).Callback(objectToAssign => myProperty = objectToAssign);

Update with example for multiple arguments:

MyObject myObject = new MyObject();
myMock.SetupGet(x => x.MyProperty).Returns(myObject);
myMock.Setup(x => x.MethodWhichSetsProperty(It.IsAny<MyObject>(), It.IsAny<MyObject>(), It.IsAny<MyObject>()))
    .Callback<MyObject, MyObject, MyObject>((myObject1, myObject2, myObject3) => 
    { 
        //Do whatever you want in here e.g.
        myProperty = myObject1.Number   myObject2.Number   myObject3.Number;
    });

CodePudding user response：

Your class has an implementation (ie, when calling MethodWhichSetProperty it internally sets a property) - but you're not mocking the class you're mocking the interface - and that interface knows nothing of your class implementation.

myMock.SetupGet(x => x.MyProperty).Returns(myObject);

This should absolutely work though, and can easily be demonstrated: https://dotnetfiddle.net/kUSkFl