def test_invalid_width_lifetime_conversions():
with pytest.raises(ValueError):
lifetime_to_width(-1)
with pytest.raises(ValueError):
width_to_lifetime(-1)
assert lifetime_to_width(0) == float("inf")
assert width_to_lifetime(0) == float("inf")
def test_valid_width_lifetime_conversions():
assert lifetime_to_width(1.5 * ps) / GeV == approx(4.388079676311604e-13)
assert 1.5 * ps * lifetime_to_width(1.5 * ps) == hbar
assert width_to_lifetime(hbar) == 1 * MeV