code: def test_true_scale(self):
      # The "true_scale_latitude" parameter only makes sense for
      # polar stereographic projections (#339 and #455).
      # For now only the proj string creation is tested
      # See test_scale_factor for test on projection.
      globe = ccrs.Globe(ellipse="sphere")
      stereo = ccrs.NorthPolarStereo(
          true_scale_latitude=30, globe=globe
      )
      other_args = {
          "ellps=sphere",
          "lat_0=90",
          "lon_0=0.0",
          "lat_ts=30",
          "x_0=0.0",
          "y_0=0.0",
      }
      check_proj_params("stere", stereo, other_args)
  
file_path: cartopy/lib/cartopy/tests/crs/test_stereographic.py
imports: import numpy
  from numpy.testing import assert_almost_equal
  import cartopy.crs
  from .helpers import check_proj_params
label_desc: Use image node_id 3 for calling the TestStereographic obj's underlying member method code with example usage: obj.test_true_scale() without return types