def test_zoom_ratio_2():
f = np.zeros((128,128))
f[32:64,32:64] = 128
z0,z1 = .7,.5
output = interpolate.zoom(f,[z0,z1])
ratio = output.sum()/f.sum()
assert np.abs(ratio - z0*z1) < .1
def test_zoom_ratio():
f = np.zeros((128,128))
f[32:64,32:64] = 128
for z in [.7,.5,.2,.1]:
output = interpolate.zoom(f,z)
ratio = output.sum()/f.sum()
assert np.abs(ratio - z*z) < .1
