code: def test_dark_palette(self):
      n = 4
      pal_forward = palettes.dark_palette("red", n)
      pal_reverse = palettes.dark_palette("red", n, reverse=True)
      assert np.allclose(pal_forward, pal_reverse[::-1])
  
      red = mpl.colors.colorConverter.to_rgb("red")
      assert pal_forward[-1] == red
  
      pal_f_from_string = palettes.color_palette("dark:red", n)
      assert pal_forward[3] == pal_f_from_string[3]
  
      pal_r_from_string = palettes.color_palette("dark:red_r", n)
      assert pal_reverse[3] == pal_r_from_string[3]
  
      pal_cmap = palettes.dark_palette("blue", as_cmap=True)
      assert isinstance(pal_cmap, mpl.colors.LinearSegmentedColormap)
  
      pal_cmap_from_string = palettes.color_palette(
          "dark:blue", as_cmap=True
      )
      assert pal_cmap(0.8) == pal_cmap_from_string(0.8)
  
      pal_cmap = palettes.dark_palette(
          "blue", as_cmap=True, reverse=True
      )
      pal_cmap_from_string = palettes.color_palette(
          "dark:blue_r", as_cmap=True
      )
      assert pal_cmap(0.8) == pal_cmap_from_string(0.8)
  
imports: import colorsys
  import numpy
  import matplotlib
  import pytest
  import numpy.testing
  from seaborn import palettes, utils, rcmod
  from seaborn.external import husl
  from seaborn._compat import get_colormap
  from seaborn.colors import xkcd_rgb, crayons
label_desc: Use image node_id 24 for calling the TestColorPalettes obj's underlying member method code with example usage: obj.test_dark_palette() without return types