code: def test_ellipsoidal2dcs_to_cf():
      ecs = Ellipsoidal2DCS(axis=Ellipsoidal2DCSAxis.LATITUDE_LONGITUDE)
      assert ecs.to_cf() == [
          {
              "standard_name": "latitude",
              "long_name": "latitude coordinate",
              "units": "degrees_north",
              "axis": "Y",
          },
          {
              "standard_name": "longitude",
              "long_name": "longitude coordinate",
              "units": "degrees_east",
              "axis": "X",
          },
      ]
  
file_path: pyproj/test/crs/test_crs_coordinate_system.py
imports: import pytest
  from pyproj.crs.coordinate_system import Cartesian2DCS, Ellipsoidal2DCS, Ellipsoidal3DCS, VerticalCS
  from pyproj.crs.enums import Cartesian2DCSAxis, Ellipsoidal2DCSAxis, Ellipsoidal3DCSAxis, VerticalCSAxis
label_desc: Use image node_id 5 for calling a global function with example usage: test_ellipsoidal2dcs_to_cf() without return types