OUT or REF parameters in C#

[urbadave]

When a mock contains a method like this:

bool OpWorkedOrError(string aParam, out string optionaErrorMsg);

How do you handle the return value of mock in NSubstitute?

I can do the following:

var subForIt = Substitute.For<IInterfaceWithOutParam>();
string optErrorMsg = string.Empty;
subForIt.OpWorkedOrError("0", out optErrorMsg).Returns(false);

But how do I set a value for the out parameter (optErrorMsg)?

urbadave

[David Tchepak]

Hi urbadave,

Sorry, we don't have support for setting out params in v1.0.

It's on the list for next release.

Regards,

David

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[PRUIVO.PT]

Hi David, can you update me on this ? I'm implementing tests for a big project and I'm short on the methods that implement out parameters.

Thanks!

[David Tchepak]

Not done yet I'm afraid.

Would it be sufficient to just have something like this?

subForIt.OpWorkedOrError("0", out optErrorMsg).Returns(x => { x[1] = "this output"; return false; });

We're looking at a (slightly) nicer syntax for this, but in the meantime would that work for you (and for anyone else interested in out/refs?))?

Regards,

David

On Fri, Jun 3, 2011 at 4:22 AM, PRUIVO.PT <pruivo.pt@gmail.com> wrote:

Hi David, can you update me on this ? I'm implementing tests for a big project and I'm short on the methods that implement out parameters.

Thanks!

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[PRUIVO.PT]

I will try it out to see if it behaves well with more complex objects
has the out parameter.
I'll get back to you with my findings.

Cheers.

[David Tchepak]

Ok, give me 48 hours and I'll push this up. 

I can email you the build if you don't want to d/load the source. Just email me off-list.

Cheers,

David

[David Tchepak]

For anyone interested I've pushed up a very rudimentary implementation of this as promised:

https://github.com/nsubstitute/NSubstitute/commit/d786d5d34df65e5956d0c15015cda1483de15436#diff-0

The examples in that diff should give you an idea of how it works.

I think we can do a bit better than this syntax-wise, but will probably keep this approach as well for a quick and dirty way of setting out/ref args.

Interested in any feedback y'all have.

Regards,

David