code: def test_departure(lon1, lon2, lat, dist):
      assert lox.departure(lon1, lon2, lat) == approx(dist)
  
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 3 for calling a global function with example usage: test_departure(lon1, lon2, lat, dist) without return types