code: def test_lonlatformatter_decimal_point():
      xticker = LongitudeFormatter(
          decimal_point=",", number_format="0.2f"
      )
      yticker = LatitudeFormatter(
          decimal_point=",", number_format="0.2f"
      )
      assert xticker(-10) == "10,00°W"
      assert yticker(-10) == "10,00°S"
  
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 18 for calling a global function with example usage: test_lonlatformatter_decimal_point() without return types