def METHOD_NAME(self):
    self.assertEqual(self.system.max_oif_objects, 0)
    with self.subTest(msg='linear stretching'):
        self.check_relaxation(kslin=1.)
    self.assertEqual(self.system.max_oif_objects, 1)
    with self.subTest(msg='neo-Hookean stretching'):
        self.check_relaxation(ks=1.)
    self.assertEqual(self.system.max_oif_objects, 2)