code: def test_custom_datum():
      cd = CustomDatum()
      assert cd.ellipsoid.name == "WGS 84"
      assert cd.prime_meridian.name == "Greenwich"
  
file_path: pyproj/test/crs/test_crs_datum.py
imports: from numpy.testing import assert_almost_equal
  from pyproj.crs.datum import CustomDatum, CustomEllipsoid, CustomPrimeMeridian, Ellipsoid, PrimeMeridian
label_desc: Use image node_id 1 for calling a global function with example usage: test_custom_datum() without return types