code: def test_categories(self):
      m = self.nybb[["BoroName", "geometry"]].explore(
          column="BoroName",
          categories=[
              "Brooklyn",
              "Staten Island",
              "Queens",
              "Bronx",
              "Manhattan",
          ],
      )
      out_str = self._fetch_map_string(m)
      assert '"Bronx","__folium_color":"#c7c7c7"' in out_str
      assert '"Manhattan","__folium_color":"#9edae5"' in out_str
      assert '"Brooklyn","__folium_color":"#1f77b4"' in out_str
      assert '"StatenIsland","__folium_color":"#98df8a"' in out_str
      assert '"Queens","__folium_color":"#8c564b"' in out_str
  
      df = self.nybb.copy()
      df["categorical"] = pd.Categorical(df["BoroName"])
      with pytest.raises(
          ValueError, match="Cannot specify 'categories'"
      ):
          df.explore(
              "categorical", categories=["Brooklyn", "Staten Island"]
          )
  
imports: import geopandas
  import numpy
  import pandas
  import pytest
  import shapely
  from packaging.version import Version
  from matplotlib import cm
  from matplotlib import colors
  from branca.colormap import StepColormap
label_desc: Use image node_id 10 for calling the TestExplore obj's underlying member method code with example usage: obj.test_categories() without return types