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using Moq with lambda expression in C#

Posted on 2014-09-10
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Last Modified: 2014-09-20
Hi Experts,

I am writing unit test using moq and have following code

 public interface IsampleData
    {
     
       UserResponse GetDetails();
      
    }

public class UserResponse
{

public IEnumerable<usertab> userlist{get;set;}
public string Name {get;set;}
public string state {get;set;}
public string country {get;set}

}

public class usertab
{
public string tname {get;set;}

public string fname {get;set;}

}

Unit test: How can I return userresponse object in the below lambda expression?

 Mock<IsampleData> userfakeObj = new Mock<IsampleData>();

                userfakeObj.Setup(x => x.GetDetails()).Returns  ?

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Question by:ksd123
  • 2
3 Comments
 
LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 500 total points
ID: 40315995
Return a new instance (filled in whatever way makes sense for your test). You might consider using NBuilder also.

e.g.

userfakeObj.Setup(x => x.GetDetails())
           .Returns(new UserResponse()
                    {
                        userlist = Enumerable.Empty<usertab>(),
                        Name = "some name",
                        state = "NY",
                        country = "USA",
                    });

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Author Comment

by:ksd123
ID: 40317686
Thank you somuch.It worked.But there is a change in the method signature of the interface ie. with <Task>

1)
 public interface IsampleData
    {
     
      <Task> UserResponse GetDetails();
      
    }

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And I have changed lambda expression to the below code.Basically I am writing unit tests with moq.Below I have get property and now I am getting "not all code path returns a value in the lambda expression of type "System.Threading.Tasks.Task" "error. Can you correct me

get

{

userfakeObj.Setup(x => x.GetDetails()).Returns(()=>

{

Task.Run(() =>
        
 {
           return new UserResponse()
                    {
                        userlist = Enumerable.Empty<usertab>(),
                        Name = "some name",
                        state = "NY",
                        country = "USA",
                    };

});

});

return userfakeobj.Object

}

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2)I am try  to fake  IEnumerable usertab with some data for the above userresponse class.Please correct me if below code is not the correct way of assigning IEnumerable data

var userdata = new usertab[]{

                   new usertab{tName="Employee",fName="abc"},
                   new usertab{tName="Employee",fName="xyz"},
                  
                };

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Thanks in Advance
0
 

Author Closing Comment

by:ksd123
ID: 40334984
Thank you
0

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