code: def test_insert_tree_different_nodes():
      # initialize root node, add 1 new node and enter another node with different distance from root, check it goes as
      # root's child and not as the other node's child
      _, dist_func = initialize_for_bktree()
      hash_dict = OrderedDict(
          {"a": "9", "b": "D", "c": "F"}
      )  # to guarantee that 'a' is the root of the tree
      bk = BKTree(hash_dict, dist_func)
      assert bk.ROOT == "a"
      assert len(bk.dict_all[bk.ROOT].children) == 2
      assert set(["b", "c"]) <= set(
          bk.dict_all[bk.ROOT].children.keys()
      )
  
file_path: imagededup/tests/test_bktree.py
imports: from collections import OrderedDict
  from imagededup.methods.hashing import Hashing
  from imagededup.handlers.search.bktree import BKTree, BkTreeNode
label_desc: Use image node_id 5 for calling a global function with example usage: test_insert_tree_different_nodes() without return types