code: def test_LongitudeFormatter_central_longitude(
      central_longitude, kwargs, expected
  ):
      formatter = LongitudeFormatter(**kwargs)
      p = ccrs.PlateCarree(central_longitude=central_longitude)
      formatter.set_axis(Mock(axes=Mock(GeoAxes, projection=p)))
      test_ticks = [-180, -120, -60, 0, 60, 120, 180]
      result = [formatter(tick) for tick in test_ticks]
      assert result == expected
  
imports: from unittest.mock import Mock
  import matplotlib.pyplot
  import numpy
  import pytest
  import cartopy.crs
  from cartopy.mpl.geoaxes import GeoAxes
  from cartopy.mpl.ticker import LatitudeFormatter, LatitudeLocator, LongitudeFormatter, LongitudeLocator
label_desc: Use image node_id 9 for calling a global function with example usage: test_LongitudeFormatter_central_longitude(central_longitude, kwargs, expected) without return types