'Test the solver_stats method.'

def test_solver_stats(self):

    prob = Problem(Minimize(norm(self.x)), [(self.x == 0)])
    prob.solve(solver=s.ECOS)
    stats = prob.solver_stats
    self.assertGreater(stats.solve_time, 0)
    self.assertGreater(stats.setup_time, 0)
    self.assertGreater(stats.num_iters, 0)
