code: def test_search_zero_tolerance():
      # Input a tree and send a search query, check whether zero retrievals are returned for zero tolerance
      hash_dict, dist_func = initialize_for_bktree()
      bk = BKTree(hash_dict, dist_func)
      query = "5"
      valid_retrievals = bk.search(query, tol=0)
      assert len(valid_retrievals) == 0
  
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 10 for calling a global function with example usage: test_search_zero_tolerance() without return types