Add unit tests for solvers/preconditioners
We have some solver and preconditioners and it would be nice to have unit tests. Essentially we can just use the dune unit tests and run them for the additional solvers/preconditioners in dumux. (I don't mean the IstlLinearSolvers but solver components, e.g. in dumux/linear/preconditioners.hh
.) But it also doesn't hurt to add unit tests for all solvers. A good idea could be (as in dune) to solve a simple laplace problem.
Edited by Timo Koch