code: def test_tight_layout2():
      """Test tight_layout for multiple subplots."""
      fig, ((ax1, ax2), (ax3, ax4)) = plt.subplots(nrows=2, ncols=2)
      example_plot(ax1)
      example_plot(ax2)
      example_plot(ax3)
      example_plot(ax4)
      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 3 for calling a global function with example usage: test_tight_layout2() without return types