Unit testing factory methods which have a concrete class as a return type

Question

So I have a factory class and I\'m trying to work out what the unit tests should do. From this question I could verify that the interface returned is of a particular concret

Answer 1

What we do is create the dependancies with factories, and we use a dependancy injection framework to substitute mock factories for the real ones when the test is run. Then we set up the appropriate expectations on those mock factories.