code: def test_ob_tran_not_rotated_latlon():
      crs = CRS(
          "+proj=ob_tran +o_proj=moll +o_lat_p=45 +o_lon_p=-90 +lon_0=-90"
      )
      with pytest.warns(UserWarning):
          cf_dict = crs.to_cf(errcheck=True)
      assert cf_dict.pop("crs_wkt").startswith("PROJCRS[")
      assert 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 22 for calling a global function with example usage: test_ob_tran_not_rotated_latlon() without return types