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+--- Thread: Returning value that was passed into a method (/Thread-Returning-value-that-was-passed-into-a-method)
Returning value that was passed into a method - invitant11933 - 07-24-2023
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?
RE: Returning value that was passed into a method - coloradoite703764 - 07-24-2023
You can use a lambda with an input parameter, like so:
.Returns((string myval) => { return myval; });
Or slightly more readable:
.Returns<string>(x => x);
RE: Returning value that was passed into a method - chondrocostal556876 - 07-24-2023
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.
RE: Returning value that was passed into a method - Sirbuckjumper3 - 07-24-2023
The generic `Returns<T>` method can handle this situation nicely.
_mock.Setup(x => x.DoSomething(It.IsAny<string>())).Returns<string>(x => x);
Or if the method requires multiple inputs, specify them like so:
_mock.Setup(x => x.DoSomething(It.IsAny<string>(), It.IsAny<int>())).Returns((string x, int y) => x);
RE: Returning value that was passed into a method - Drfoliage1 - 07-24-2023
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
});
```