def test_free_cell(celldim, subtitle, expected_scale):
from numpy import allclose, abs, array
from pylada.espresso import Card, Namelist
namelist = Namelist({'ibrav': 0})
if celldim is not None:
namelist.celldm = celldim
card = Card('CELL_PARAMETERS',
subtitle=subtitle,
value="""
1 2 3
2 3 4
4 4 6
""")
cell, scale = sh._read_free(namelist, card)
assert allclose(cell,
array([[1, 2, 4], [2, 3, 4], [3, 4, 6]], dtype='float64'))
assert abs(scale - expected_scale) < 1e-8
