code: def test_transparency_tex():
      mpl.rcParams["text.usetex"] = True
      fig, ax = plt.subplots()
      ax.set_axis_off()
      ax.plot([0, 1], color="r", alpha=0)
      ax.text(0.5, 0.5, "foo", color="r", alpha=0)
  
imports: from collections import Counter
  from pathlib import Path
  import io
  import re
  import tempfile
  import numpy
  import pytest
  from matplotlib import cbook, path, patheffects, font_manager
  from matplotlib.figure import Figure
  from matplotlib.patches import Ellipse
  from matplotlib.testing._markers import needs_ghostscript, needs_usetex
  from matplotlib.testing.decorators import check_figures_equal, image_comparison
  import matplotlib
  import matplotlib.collections
  import matplotlib.colors
  import matplotlib.pyplot
label_desc: Use image node_id 5 for calling a global function with example usage: test_transparency_tex() without return types