code: def test_central_longitude(name, proj, lim, lon):
      eck = proj(central_longitude=lon)
      other_args = {"a=6378137.0", f"lon_0={lon}"}
      check_proj_params(name, eck, other_args)
  
      assert_almost_equal(eck.x_limits, [-lim, lim], decimal=5)
      assert_almost_equal(eck.y_limits, [-lim / 2, lim / 2])
  
file_path: cartopy/lib/cartopy/tests/crs/test_eckert.py
imports: import numpy
  from numpy.testing import assert_almost_equal
  import pytest
  import cartopy.crs
  from .helpers import check_proj_params
label_desc: Use image node_id 6 for calling a global function with example usage: test_central_longitude(name, proj, lim, lon) without return types