code: def test_multipage_properfinalize():
      pdfio = io.BytesIO()
      with PdfPages(pdfio) as pdf:
          for i in range(10):
              fig, ax = plt.subplots()
              ax.set_title("This is a long title")
              fig.savefig(pdf, format="pdf")
      s = pdfio.getvalue()
      assert s.count(b"startxref") == 1
      assert len(s) < 40000
  
imports: import datetime
  import decimal
  import io
  import os
  from pathlib import Path
  import numpy
  import pytest
  import matplotlib
  from matplotlib import pyplot, rcParams, font_manager
  from matplotlib.cbook import _get_data_path
  from matplotlib.ft2font import FT2Font
  from matplotlib.font_manager import findfont, FontProperties
  from matplotlib.backends._backend_pdf_ps import get_glyphs_subset
  from matplotlib.backends.backend_pdf import PdfPages
  from matplotlib.patches import Rectangle
  from matplotlib.testing.decorators import check_figures_equal, image_comparison
  from matplotlib.testing._markers import needs_usetex
label_desc: Use image node_id 4 for calling a global function with example usage: test_multipage_properfinalize() without return types