code: def test_lookup(self):
      style = self.style
      style.configure("TButton", background="yellow")
      style.map(
          "TButton", background=[("active", "background", "blue")]
      )
  
      self.assertEqual(style.lookup("TButton", "background"), "yellow")
      self.assertEqual(
          style.lookup(
              "TButton", "background", ["active", "background"]
          ),
          "blue",
      )
      self.assertEqual(
          style.lookup(
              "TButton", "optionnotdefined", default="iknewit"
          ),
          "iknewit",
      )
  
file_path: catboost/contrib/tools/python/src/Lib/lib-tk/test/test_ttk/test_style.py
imports: import unittest
  import Tkinter
  import ttk
  from test.test_support import requires, run_unittest
  from test_ttk.support import AbstractTkTest
label_desc: Use image node_id 4 for calling the StyleTest obj's underlying member method code with example usage: obj.test_lookup() without return types