code: def suite():
      color_suite = unittest.defaultTestLoader.loadTestsFromTestCase(
          ColorTests
      )
      palette_suite = unittest.defaultTestLoader.loadTestsFromTestCase(
          PaletteTests
      )
      return unittest.TestSuite([color_suite, palette_suite])
  
imports: import unittest
  from igraph import hsv_to_rgb, hsva_to_rgba, hsl_to_rgb, hsla_to_rgba, rgb_to_hsl, rgba_to_hsla, rgba_to_hsva, rgb_to_hsv, GradientPalette, AdvancedGradientPalette
label_desc: Use image node_id 1 for calling a global function with example usage: suite() and returns: unittest