"""`Panel.ignore_lateral_prestress` drops the in-plane prestress term from
the corner stresses -- the plant's reference-tool convention -- and is off
by default."""
from panellift.model import Panel


def test_default_is_off():
    assert Panel(mark='X', length_ft=20.0, width_ft=10.0,
                 thickness_in=8.0).ignore_lateral_prestress is False


def test_flag_is_a_plain_field():
    p = Panel(mark='X', length_ft=20.0, width_ft=10.0, thickness_in=8.0,
              ignore_lateral_prestress=True)
    assert p.ignore_lateral_prestress is True