MOQ: Returning value that was passed into a method
Even more useful, if you have multiple parameters you can access any/all of them with:
_mock.Setup(x => x.DoSomething(It.IsAny<string>(),It.IsAny<string>(),It.IsAny<string>()) .Returns((string a, string b, string c) => string.Concat(a,b,c));
You always need to reference all the arguments, to match the method's signature, even if you're only going to use one of them.
I have a method on an interface:
string DoSomething(string whatever);
I want to mock this with MOQ, so that it returns whatever was passed in - something like:
_mock.Setup( theObject => theObject.DoSomething( It.IsAny<string>( ) ) ) .Returns( [the parameter that was passed] ) ;
Accessing the original arguments of Expect() when assembling the value in Returns()
From the moq quickstart guide:
// access invocation arguments when returning a value mock.Setup(x => x.Execute(It.IsAny<string>())) .Returns((string s) => s.ToLower());
Which suggests therefore that you can fill in your ??? as
CollectionMock.Expect(c => c.GetById(It.IsAny<List<int>>())) .Returns((List<int> l) => //Do some stuff with l );
Can Moq return the real object instance passed into a Setup method called on a Mock with a void return type?
Channeling some psychic powers here...
It looks like you may be using NHibernate, which if so that means
SaveOrUpdate has this signature:
void SaveOrUpdate(object obj);
So, in order to get your
Foo object you need to specify
object as the type parameter, e.g.:
_session.Setup(session => session.SaveOrUpdate(It.IsAny<object>())) .Callback<object>(objectBeingSaved => foo = objectBeingSaved as Foo);