code: def test_polar_stereographic_a_operation__defaults():
      aeaop = PolarStereographicAConversion(90)
      assert aeaop.name == "unknown"
      assert aeaop.method_name == "Polar Stereographic (variant A)"
      assert _to_dict(aeaop) == {
          "Latitude of natural origin": 90.0,
          "Longitude of natural origin": 0.0,
          "False easting": 0.0,
          "False northing": 0.0,
          "Scale factor at natural origin": 1.0,
      }
  
imports: import pytest
  from numpy.testing import assert_almost_equal
  from pyproj.crs import GeographicCRS
  from pyproj.crs.coordinate_operation import AlbersEqualAreaConversion, AzimuthalEquidistantConversion, EquidistantCylindricalConversion, GeostationarySatelliteConversion, HotineObliqueMercatorBConversion, LambertAzimuthalEqualAreaConversion, LambertConformalConic1SPConversion, LambertConformalConic2SPConversion, LambertCylindricalEqualAreaConversion, LambertCylindricalEqualAreaScaleConversion, MercatorAConversion, MercatorBConversion, OrthographicConversion, PlateCarreeConversion, PolarStereographicAConversion, PolarStereographicBConversion, PoleRotationNetCDFCFConversion, RotatedLatitudeLongitudeConversion, SinusoidalConversion, StereographicConversion, ToWGS84Transformation, TransverseMercatorConversion, UTMConversion, VerticalPerspectiveConversion
  from pyproj.exceptions import CRSError
label_desc: Use image node_id 26 for calling a global function with example usage: test_polar_stereographic_a_operation__defaults() without return types