code: def test_mixedmode():
      mpl.rcParams.update(
          {"font.family": "serif", "pgf.rcfonts": False}
      )
      Y, X = np.ogrid[-1:1:40j, -1:1:40j]
      plt.pcolor(X**2 + Y**2).set_rasterized(True)
  
imports: import datetime
  from io import BytesIO
  import os
  import shutil
  import numpy
  from packaging.version import parse
  import pytest
  import matplotlib
  import matplotlib.pyplot
  from matplotlib.testing import _has_tex_package, _check_for_pgf
  from matplotlib.testing.exceptions import ImageComparisonFailure
  from matplotlib.testing.compare import compare_images
  from matplotlib.backends.backend_pgf import PdfPages
  from matplotlib.testing.decorators import _image_directories, check_figures_equal, image_comparison
  from matplotlib.testing._markers import needs_ghostscript, needs_pgf_lualatex, needs_pgf_pdflatex, needs_pgf_xelatex
label_desc: Use image node_id 8 for calling a global function with example usage: test_mixedmode() without return types