code: def test_not_found_tree():
      i = AnnoyIndex(10, "angular")
      with pytest.raises(IOError):
          i.load("nonexists.tree")
  
imports: import os
  import random
  import pytest
  from annoy import AnnoyIndex
label_desc: Use image node_id 1 for calling a global function with example usage: test_not_found_tree() without return types