def test_trunk_radius_length_point_tree():
t = PointTree((0, 0, 0, 42))
nt.assert_equal(mtr.trunk_section_length(t), 0.0)
def test_trunk_section_length():
t = PointTree((0, 0, 0, 42))
tt = t.add_child(PointTree((10, 0, 0, 4)))
tt.add_child(PointTree((10, 15, 0, 4)))
nt.assert_almost_equal(mtr.trunk_section_length(t), 25.0)
