Argument Matchers and ref/out keywords

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Bruno Silva

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Oct 8, 2018, 10:35:18 AM10/8/18
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Hi!
I wanna create a mock for my MySubClass. But, it has an argument ref in one of its methods.
The argument ref is an object of type MyReference. The object is created in another method, so I don't have control over the variable. 

So, there is no way to do something like this, the mock doesn't work:

var sub = Substitute.For<MySubClass>();
MyReference reference;
sub.MyMethod(Arg.Any<int>(), ref reference).Returns(x => { x[0] = new MyReference(); return true; });
CallerClass caller =new  CallerClass();
caller.CallMySubClass();

I need something this:

var sub = Substitute.For<MySubClass>();
MyReference reference;
sub.MyMethod(Arg.Any<int>(), ref Arg.Any<MyReference>()).Returns(x => { x[0] = new MyReference(); return true; });


Is there any way to use argument matchers (or another way) to solve it?

David Tchepak

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Oct 8, 2018, 4:53:16 PM10/8/18
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Hi Bruno,

For the case you have shown I recommend using `.ReturnsForAnyArgs(x => ...)`.

In positive news, the next release of NSubstitute is getting the syntax you've shown in your second code snippet! :) (so that snippet will work unchanged!) This feature is currently in the repository at https://github.com/nsubstitute/NSubstitute so if you want to try a local build of NSubstitute you can start using this right away.

There are some more examples of working with out/ref arguments here: https://github.com/nsubstitute/NSubstitute/issues/459

Please let me know if you need more information.

Regards,
David

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Bruno Silva

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Oct 15, 2018, 1:27:09 PM10/15/18
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Hi David!
Thank you for your reply.
It helps me :)
I will try a local build with the code, but I'm concerned if it will be compatible with my .Net version 4.0

Best Regards,
Bruno.

David Tchepak

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Oct 15, 2018, 8:10:38 PM10/15/18
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Hi Bruno,

Unfortunately the latest builds will not work with NET40. :(

Even without the new feature you can still get out/ref to match using `ReturnsForAnyArgs`, or using matchers as per the examples in  https://github.com/nsubstitute/NSubstitute/issues/459.

Regards,
David

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Bruno Silva

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Dec 17, 2018, 6:49:28 AM12/17/18
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Hi, 
thank you for your fast answer. 
We had a lot of a lot of work to overcome some problems, especially because your version is old (2.0.3.0, with .net4.0) :(
I hope we can update .net framework soon.
Thank you again

Regards,
Bruno.
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