code: def test_grib_rotated_pole_to_cf():
      rotated_pole_wkt = """GEOGCRS["Coordinate System imported from GRIB file",
          BASEGEOGCRS["Coordinate System imported from GRIB file",
              DATUM["unnamed",
                  ELLIPSOID["Sphere",6371229,0,
                      LENGTHUNIT["metre",1,
                          ID["EPSG",9001]]]],
              PRIMEM["Greenwich",0,
                  ANGLEUNIT["degree",0.0174532925199433,
                      ID["EPSG",9122]]]],
          DERIVINGCONVERSION["Pole rotation (GRIB convention)",
              METHOD["Pole rotation (GRIB convention)"],
              PARAMETER["Latitude of the southern pole (GRIB convention)",-33.443381,
                  ANGLEUNIT["degree",0.0174532925199433,
                      ID["EPSG",9122]]],
              PARAMETER["Longitude of the southern pole (GRIB convention)",-93.536426,
                  ANGLEUNIT["degree",0.0174532925199433,
                      ID["EPSG",9122]]],
              PARAMETER["Axis rotation (GRIB convention)",0,
                  ANGLEUNIT["degree",0.0174532925199433,
                      ID["EPSG",9122]]]],
          CS[ellipsoidal,2],
              AXIS["latitude",north,
                  ORDER[1],
                  ANGLEUNIT["degree",0.0174532925199433,
                      ID["EPSG",9122]]],
              AXIS["longitude",east,
                  ORDER[2],
                  ANGLEUNIT["degree",0.0174532925199433,
                      ID["EPSG",9122]]]]"""
      crs = CRS(rotated_pole_wkt)
      with pytest.warns(UserWarning):
          cf_dict = crs.to_cf(errcheck=True)
      assert cf_dict.pop("crs_wkt").startswith("GEOGCRS[")
      assert not cf_dict
  
imports: import numpy
  import pytest
  from numpy.testing import assert_almost_equal
  from packaging import version
  from pyproj import CRS
  from pyproj.crs import ProjectedCRS
  from pyproj.crs._cf1x8 import _try_list_if_string
  from pyproj.crs.coordinate_operation import LambertAzimuthalEqualAreaConversion, LambertCylindricalEqualAreaConversion, MercatorAConversion, OrthographicConversion, PolarStereographicAConversion, PolarStereographicBConversion, SinusoidalConversion, StereographicConversion, VerticalPerspectiveConversion
  from pyproj.exceptions import CRSError
  from test.conftest import PROJ_GTE_901, PROJ_LOOSE_VERSION
label_desc: Use image node_id 13 for calling a global function with example usage: test_grib_rotated_pole_to_cf() without return types