code: def test_rsphere_authalic():
      assert rsphere.authalic() == approx(6371007.1809)
  
file_path: pymap3d/src/pymap3d/tests/test_rsphere.py
imports: import pymap3d
  import pymap3d.rcurve
  import pymap3d.rsphere
  import pytest
  from pytest import approx
label_desc: Use image node_id 4 for calling a global function with example usage: test_rsphere_authalic() without return types