code: def test_central_longitude(self, lon):
      eqdc = ccrs.EquidistantConic()
      eqdc_offset = ccrs.EquidistantConic(central_longitude=lon)
      other_args = {
          "ellps=WGS84",
          f"lon_0={lon}",
          "lat_0=0.0",
          "x_0=0.0",
          "y_0=0.0",
          "lat_1=20.0",
          "lat_2=50.0",
      }
      check_proj_params("eqdc", eqdc_offset, other_args)
  
      assert_array_almost_equal(
          eqdc_offset.boundary.coords,
          eqdc.boundary.coords,
          decimal=0,
      )
  
file_path: cartopy/lib/cartopy/tests/crs/test_equidistant_conic.py
imports: import numpy
  from numpy.testing import assert_almost_equal, assert_array_almost_equal
  import pyproj
  import pytest
  import cartopy.crs
  from .helpers import check_proj_params
label_desc: Use image node_id 4 for calling the TestEquidistantConic obj's underlying member method code with example usage: obj.test_central_longitude(lon) without return types