Draft: Add a test for 2p tracer with box discretization
For testing 2p tracer, only tpfa has been available so far. The main change for making it work also for box is to adapt the vector for storing the volume fluxes and the access to that vector.
For testing 2p tracer, only tpfa has been available so far. The main change for making it work also for box is to adapt the vector for storing the volume fluxes and the access to that vector.