Adds /users/:userId/roles route tests.
Adds /users/:userId/roles route tests.

e-ucm/a2,manuel-freire/a2,RotaruDan/test-users,RotaruDan/test-users,manuel-freire/a2,e-ucm/a2,RotaruDan/test-users,manuel-freire/a2,e-ucm/a2