code: def test_tight_layout9():
      # Test tight_layout for non-visible subplots
      # GH 8244
      f, axarr = plt.subplots(2, 2)
      axarr[1][1].set_visible(False)
      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 10 for calling a global function with example usage: test_tight_layout9() without return types