code: def test_surrogates():
      assert fix_surrogates("\udbff\udfff") == "\U0010ffff"
      assert fix_surrogates("\ud800\udc00") == "\U00010000"
  
file_path: python-ftfy/tests/test_characters.py
imports: from ftfy import fix_encoding, fix_encoding_and_explain, fix_text, fix_and_explain, apply_plan
  from ftfy.fixes import remove_control_chars, fix_surrogates
  from ftfy.chardata import possible_encoding
  from ftfy.badness import badness
  import unicodedata
  import sys
label_desc: Use image node_id 6 for calling a global function with example usage: test_surrogates() without return types