def test_normal_implicit(self):
        """min<max, no periodic domain defined"""
        lambda_min = -150
        lambda_max = 70
        vol = volume.PeriodicCVDefinedVolume(op_id,
                                          lambda_min, lambda_max)
        assert_equal(vol.__str__(),
            "{x|Id(x) [periodic] in [-150, 70]}")
        # out of state
        assert_equal(False, vol(lambda_min-1.0))
        assert_equal(False, vol(lambda_max+1.0))
        # in state
        assert_equal(True, vol(lambda_min+1.0))
        assert_equal(True, vol(lambda_max-1.0))
        # border
        assert_equal(True, vol(lambda_min))
        assert_equal(False, vol(lambda_max))