plus you know you are going to pile up memory in the Heap!

No you don't know that. That's the point! Any method you call can allocate a long-living object. Constructors are no special (well, they are special, but in a totally different way)

mmh, I see your point, but I am convinced 95%, take my example please. I am declaring authority, but

DatabaseContract

does not need to be instantiated because is referring to a simple constant, so in a testing situation I do not need to mock authority i guess