code: def test_tight_layout1():
      """Test tight_layout for a single subplot."""
      fig, ax = plt.subplots()
      example_plot(ax, fontsize=24)
      plt.tight_layout()
  
imports: import warnings
  import numpy
  from numpy.testing import assert_array_equal
  import pytest
  import matplotlib
  from matplotlib.testing.decorators import image_comparison
  import matplotlib.pyplot
  from matplotlib.offsetbox import AnchoredOffsetbox, DrawingArea
  from matplotlib.patches import Rectangle
label_desc: Use image node_id 2 for calling a global function with example usage: test_tight_layout1() without return types