def METHOD_NAME(structures):
    """Test scaled_cell's PDB-designated validation: inverse of det(SCALE) = Volume of cell"""
    for structure in structures:
        # Manual calculation of volume = |a_1 . (a_2 x a_3)|
        a_1 = structure.lattice_vectors[0]
        a_2 = structure.lattice_vectors[1]
        a_3 = structure.lattice_vectors[2]
        a_mid_0 = a_2[1] * a_3[2] - a_2[2] * a_3[1]
        a_mid_1 = a_2[2] * a_3[0] - a_2[0] * a_3[2]
        a_mid_2 = a_2[0] * a_3[1] - a_2[1] * a_3[0]
        volume_from_cellpar = abs(
            a_1[0] * a_mid_0 + a_1[1] * a_mid_1 + a_1[2] * a_mid_2
        )
        scale = scaled_cell(structure.lattice_vectors)
        volume_from_scale = math.fabs(1 / numpy.linalg.det(scale))
        assert volume_from_scale == pytest.approx(volume_from_cellpar)