code: def test_curve_style_mapping_ndoverlay_dimensions(self):
      ndoverlay = NdOverlay(
          {
              (0, "A"): Curve([1, 2, 0]),
              (0, "B"): Curve([1, 2, 1]),
              (1, "A"): Curve([1, 2, 2]),
              (1, "B"): Curve([1, 2, 3]),
          },
          ["num", "cat"],
      ).opts(
          {
              "Curve": dict(
                  color=dim("num").categorize({0: "red", 1: "blue"}),
                  linestyle=dim("cat").categorize(
                      {"A": "-.", "B": "-"}
                  ),
              )
          }
      )
      plot = mpl_renderer.get_plot(ndoverlay)
      for (num, cat), sp in plot.subplots.items():
          artist = sp.handles["artist"]
          color = artist.get_color()
          if num == 0:
              self.assertEqual(color, "red")
          else:
              self.assertEqual(color, "blue")
          linestyle = artist.get_linestyle()
          if cat == "A":
              self.assertEqual(linestyle, "-.")
          else:
              self.assertEqual(linestyle, "-")
  
imports: import datetime
  import numpy
  import pandas
  import pytest
  from holoviews.core.options import AbbreviatedException
  from holoviews.core.overlay import NdOverlay
  from holoviews.element import Curve
  from holoviews.util.transform import dim
  from .test_plot import TestMPLPlot, mpl_renderer
label_desc: Use image node_id 21 for calling the TestCurvePlot obj's underlying member method code with example usage: obj.test_curve_style_mapping_ndoverlay_dimensions() without return types