code: def test_minus_signs_with_tex(fig_test, fig_ref, texsystem):
      if not _check_for_pgf(texsystem):
          pytest.skip(texsystem + " + pgf is required")
      mpl.rcParams["pgf.texsystem"] = texsystem
      fig_test.text(0.5, 0.5, "$-1$")
      fig_ref.text(0.5, 0.5, "$\N{MINUS SIGN}1$")
  
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 17 for calling a global function with example usage: test_minus_signs_with_tex(fig_test, fig_ref, texsystem) without return types