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)

The `Returns` should be the same as it would be for the first case.. What's the problem you're having? — Jordan Kaye, Oct 01 '12 at 19:21

score 8 · Accepted Answer · edited Mar 04 '22 at 18:52

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
                    )
     );

fml...first one is what I was looking for. Other notation is good to know as well, thanks. — Terry, Oct 01 '12 at 19:34

score 6 · Answer 2 · edited Jun 06 '19 at 06:59

6

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));

edited Jun 06 '19 at 06:59

Bohdan Kuts

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answered Oct 01 '12 at 19:28

Mike Parkhill

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score 2 · Answer 3 · answered Oct 01 '12 at 19:32

2

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() );

answered Oct 01 '12 at 19:32

Reid Evans

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score 0 · Answer 4 · edited May 23 '17 at 12:32

0

See Mark Seeman's answer to this question:

Settings variable values in a Moq Callback() call

It might help.

edited May 23 '17 at 12:32

Community

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answered Oct 01 '12 at 19:32

wageoghe

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Moq - mocking multiple arguments

4 Answers4