Returning value that was passed into a method

user_28901 0
Viewed 183094

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] ) ;

Any ideas?

moq mocking c#
4 Answers

You can use a lambda with an input parameter, like so:

.Returns((string myval) => { return myval; });

Or slightly more readable:

.Returns<string>(x => x);
mhamrah_308810

For those who are not using Moq, there's a way with NSubstitute.

mock.Method(Arg.Any<string>(), Arg.Any<string>(), Arg.Any<string>()).Returns(callInfo =>
    {
         var arg1 = callInfo[0].ToString();
         var arg2 = callInfo[1].ToString();
         var argN = callInfo[n-1].ToString();
         return arg1 + arg2 + argN; //or whatever
    });
user_86452240
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