substitute for abstract class(methods)

[tasos foobar]

Hello!
I know that nsub prefers interfaces(and virtual methods) , so my question is can i create a substitute for an abstract class and for example
return a specific value(while testing) from an abstract method of this class? Is this ok or dangerous?
Thanks!

[David Tchepak]

Hi,

Yes, you can create a substitute for an abstract class. You will be able to set specific values for any `abstract` or `virtual` members of the class. The potential problem is that real code can be executed at test time, including:

* constructor logic

* non-virtual members

This may or not be a problem for you, depending on the nature of the real code being executed, and how careful you are in calling virtual/non-virtual members during your tests. The other issue is that if you do call a `non-virtual` member without realising it (say, a member is changed from `virtual` to non-virtual), NSubstitute can get confused, producing unexpected behaviour or tricky-to-debug errors.

To be safest you can make sure the constructor code doesn't do anything too side-effecty, and make all members `virtual` / `abstract`.

Hope this helps.

Regards,

David

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[tasos foobar]

Thank you very much David!
Much appreciated!