code: def test_welsh_flag():
      # ftfy used to remove "tag characters", but they have been repurposed in the
      # "Flag of England", "Flag of Scotland", and "Flag of Wales" emoji sequences.
      text = "This flag has a dragon on it 🏴󠁧󠁢󠁷󠁬󠁳󠁿"
      assert remove_control_chars(text) == text
  
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 4 for calling a global function with example usage: test_welsh_flag() without return types