def test_extend_upward(r_plot, end):
r_plot = np.array(r_plot)
ratio = r_plot[:-1] / r_plot[1:]
steep_upward = ratio <= .9
downward = ratio > 1
e = _extend_region(steep_upward, downward, 0, 2)
assert e == end
def test_extend_downward(r_plot, end):
r_plot = np.array(r_plot)
ratio = r_plot[:-1] / r_plot[1:]
steep_downward = ratio >= 1 / 0.9
upward = ratio < 1
e = _extend_region(steep_downward, upward, 0, 2)
assert e == end
