code: def test_meridian_arc(lat1, lat2, arclen):
      """
      meridianarc(deg2rad(40), deg2rad(80), wgs84Ellipsoid)
      """
  
      assert lox.meridian_arc(lat1, lat2) == approx(arclen)
  
file_path: pymap3d/src/pymap3d/tests/test_rhumb.py
imports: import pymap3d.lox
  import pytest
  from pytest import approx
label_desc: Use image node_id 2 for calling a global function with example usage: test_meridian_arc(lat1, lat2, arclen) without return types