Moq - mocking multiple arguments

Question

Half the links I try off the Moq page are broken, including the one for their official API documentation. So I'll ask here.

I have successfully used a single "catch all" parameter like so:

mockRepo.Setup(r => r.GetById(It.IsAny<int>())).Returns((int i) => mockCollection.Where(x => x.Id == i).Single());

However I can't figure out how to achieve the same behavior with multiple parameters.

mockRepo.Setup(r => r.GetByABunchOfStuff(It.IsAny<int>(), It.IsAny<string>(), It.IsAny<int>())).Returns( ..... );

The .... is the part I can't figure out.

---

Edit in response to Jordan:

The problem is how to represent the 3 parameters instead of just one.

How to turn:

(int i) => mockCollection.Where(x => x.Id == i)

into:

(int i), (string s), (int j) => mockCollection.Where(x => x.Id == i && x.SomeProp == s && x.SomeOtherProp == j)

Answer 1

It's pretty much the same as with a single parameter:

.Returns
      (
         (int i, string s, int x) 
                => mockCollection.Where
                     (
                             x => x.Id == i 
                          && x.SomeProp == s 
                          && x.SomeOtherProp == x
                     )
      );

Or use the generic variant of returns:

.Returns<int, string, int>
     (
          (i, s, x) 
               => mockCollection.Where
                    (
                         x => x.Id == i 
                         && x.SomeProp == s 
                         && x.SomeOtherProp == x
                    )
     );

Answer 2

I think what you need is:

   mockRepo
       .Setup(r => r.GetByABunchOfStuff(It.IsAny<int>(), It.IsAny<string>(), It.IsAny<int>()))
       .Returns<int,string,int>((id, someProp, someOtherProp) =>
           mockCollection.Where(x => x.Id == i && x.SomeProp == s && x.SomeOtherProp == x));

Answer 3

Do you mean how do you write the correct lambda?

mockRepo.Setup(r => r.GetByABunchOfStuff(It.IsAny<int>(), It.IsAny<string>(), It.IsAny<int>()))
        .Returns((int i, string s, int i2) => doSomething() );