def test_scales(self):
pim = PersImage()
wf = pim.weighting(np.array([[0, 1], [1, 2], [3, 4]]))
assert wf([1, 0]) == 0
assert wf([1, 4]) == 1
assert wf([1, 2]) == .5
def test_zero_on_xaxis(self):
pim = PersImage()
wf = pim.weighting()
assert wf([1, 0]) == 0
assert wf([100, 0]) == 0
assert wf([99, 1.4]) == 1.4