code: def test_icon_valid_marker_colors():
      assert len(Icon.color_options) == 19
      with warnings.catch_warnings():
          warnings.simplefilter("error")
          for color in Icon.color_options:
              Icon(color=color)
  
imports: import warnings
  import numpy
  import pytest
  from folium import GeoJson, Map, TileLayer
  from folium.map import CustomPane, Icon, LayerControl, Marker, Popup
  from folium.utilities import normalize
label_desc: Use image node_id 12 for calling a global function with example usage: test_icon_valid_marker_colors() without return types