code: def test_configure_background(self):
      image = tkinter.BitmapImage("::img::test", master=self.root)
      self.assertEqual(image["background"], "-background {} {} {} {}")
      image.configure(background="blue")
      self.assertEqual(image["background"], "-background {} {} {} blue")
  
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 7 for calling the BitmapImageTest obj's underlying member method code with example usage: obj.test_configure_background() without return types