code: def test_constrained_layout14():
      """Test that padding works."""
      fig, axs = plt.subplots(2, 2, layout="constrained")
      for ax in axs.flat:
          pcm = example_pcolor(ax, fontsize=12)
          fig.colorbar(pcm, ax=ax, shrink=0.6, aspect=20.0, pad=0.02)
      fig.get_layout_engine().set(
          w_pad=3.0 / 72.0, h_pad=3.0 / 72.0, hspace=0.2, wspace=0.2
      )
  
imports: import gc
  import numpy
  import pytest
  import matplotlib
  from matplotlib.testing.decorators import image_comparison
  import matplotlib.pyplot
  import matplotlib.transforms
  from matplotlib import gridspec, ticker
label_desc: Use image node_id 18 for calling a global function with example usage: test_constrained_layout14() without return types