code: def test_constrained_layout15():
      """Test that rcparams work."""
      mpl.rcParams["figure.constrained_layout.use"] = True
      fig, axs = plt.subplots(2, 2)
      for ax in axs.flat:
          example_plot(ax, fontsize=12)
  
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 19 for calling a global function with example usage: test_constrained_layout15() without return types