code: def test_geodetic_isometric(geodetic_lat, isometric_lat):
      isolat = latitude.geodetic2isometric(geodetic_lat)
      assert isolat == approx(isometric_lat)
      assert isinstance(isolat, float)
  
      assert latitude.geodetic2isometric(
          radians(geodetic_lat), deg=False
      ) == approx(radians(isometric_lat))
  
      assert latitude.isometric2geodetic(isometric_lat) == approx(
          geodetic_lat
      )
      assert latitude.isometric2geodetic(
          radians(isometric_lat), deg=False
      ) == approx(radians(geodetic_lat))
  
file_path: pymap3d/src/pymap3d/tests/test_latitude.py
imports: from math import inf, radians
  import pymap3d.latitude
  import pymap3d.rcurve
  import pytest
  from pytest import approx
label_desc: Use image node_id 4 for calling a global function with example usage: test_geodetic_isometric(geodetic_lat, isometric_lat) without return types