Added unit tests for MetroRecolver.
Added unit tests for MetroRecolver.

fernandalavalle/mlab-ns,m-lab/mlab-ns,m-lab/mlab-ns,fernandalavalle/mlab-ns,m-lab/mlab-ns,fernandalavalle/mlab-ns,m-lab/mlab-ns,fernandalavalle/mlab-ns