Question

I have a windows service which recieves messages from a 3rd party service

Each time it recieves a message it updates an in-memory record (held in List<MyObj>) and periodically broadcasts them

I would like to test the state of the List

Options I have come up with are

1. Change the visibility of the List from private to protected. Then make a Test-Specific subclass which has a public property that exposes the state

2. add a public property to the class that is only compiled when in debug mode.
   i.e.

#if (DEBUG)
        public IList<MyObj> TestProperty
        {
            get { return _myObj; }
        }
#endif

Which is the best solution (or least bad)?

Is there a better way?

*EDIT*

Just found this article which provides a thorough run down of all the options

http://www.codeproject.com/KB/cs/testnonpublicmembers.aspx

Answer 1

You have two options:

1. Make an internal property to expose the field and then grant access via the InternalsVisibleTo attribute to your test assembly. This way, you can keep encapsulation.
2. Directly access the field via Reflection. All Testing frameworks that I know have an API for that (e.g. PrivateObject in MSTest or Mirror in MbUnit…).

HTH.
Thomas