code: def test_configure_palette(self):
      image = tkinter.PhotoImage("::img::test", master=self.root)
      self.assertEqual(image["palette"], "")
      image.configure(palette=256)
      self.assertEqual(image["palette"], "256")
      image.configure(palette="3/4/2")
      self.assertEqual(image["palette"], "3/4/2")
  
imports: import unittest
  import tkinter
  from test import support
  from test.support import os_helper
  from test.test_tkinter.support import AbstractTkTest, AbstractDefaultRootTest, requires_tk
label_desc: Use image node_id 19 for calling the PhotoImageTest obj's underlying member method code with example usage: obj.test_configure_palette() without return types