code: def test_mathtext_fallback(fallback, fontlist):
      mpl.font_manager.fontManager.addfont(
          str(Path(__file__).resolve().parent / "mpltest.ttf")
      )
      mpl.rcParams["svg.fonttype"] = "none"
      mpl.rcParams["mathtext.fontset"] = "custom"
      mpl.rcParams["mathtext.rm"] = "mpltest"
      mpl.rcParams["mathtext.it"] = "mpltest:italic"
      mpl.rcParams["mathtext.bf"] = "mpltest:bold"
      mpl.rcParams["mathtext.bfit"] = "mpltest:italic:bold"
      mpl.rcParams["mathtext.fallback"] = fallback
  
      test_str = r"a$A\AA\breve\gimel$"
  
      buff = io.BytesIO()
      fig, ax = plt.subplots()
      fig.text(0.5, 0.5, test_str, fontsize=40, ha="center")
      fig.savefig(buff, format="svg")
      tspans = ET.fromstring(buff.getvalue()).findall(
          ".//{http://www.w3.org/2000/svg}tspan[@style]"
      )
      # Getting the last element of the style attrib is a close enough
      # approximation for parsing the font property.
      char_fonts = [
          shlex.split(tspan.attrib["style"])[-1] for tspan in tspans
      ]
      assert char_fonts == fontlist
      mpl.font_manager.fontManager.ttflist.pop()
  
imports: from __future__ import annotations
  import io
  from pathlib import Path
  import platform
  import re
  import shlex
  from xml.etree import ElementTree
  from typing import Any
  import numpy
  from packaging.version import parse
  import pyparsing
  import pytest
  import matplotlib
  from matplotlib.testing.decorators import check_figures_equal, image_comparison
  import matplotlib.pyplot
  from matplotlib import mathtext, _mathtext
label_desc: Use image node_id 17 for calling a global function with example usage: test_mathtext_fallback(fallback, fontlist) without return types