code: def test_default_font():
      f = fitz.Font()
      assert str(f) == "Font('Noto Serif Regular')"
      assert repr(f) == "Font('Noto Serif Regular')"
  
imports: import io
  import os
  import fitz
  import pickle
label_desc: Use image node_id 18 for calling a global function with example usage: test_default_font() without return types