code: def test_less_than_256_characters():
      with open(
          "Tests/fonts/10x20-ISO8859-1-fewer-characters.pcf", "rb"
      ) as test_file:
          font = PcfFontFile.PcfFontFile(test_file)
      assert isinstance(font, FontFile.FontFile)
      # check the number of characters in the font
      assert len([_f for _f in font.glyph if _f]) == 127
  
file_path: pillow/Tests/test_font_pcf.py
imports: from __future__ import annotations
  import os
  import pytest
  from PIL import FontFile, Image, ImageDraw, ImageFont, PcfFontFile
  from .helper import assert_image_equal_tofile, assert_image_similar_tofile, skip_unless_feature
label_desc: Use image node_id 3 for calling a global function with example usage: test_less_than_256_characters() without return types