code: def test_constrained_layout20():
      """Smoke test cl does not mess up added Axes"""
      gx = np.linspace(-5, 5, 4)
      img = np.hypot(gx, gx[:, None])
  
      fig = plt.figure()
      ax = fig.add_axes([0, 0, 1, 1])
      mesh = ax.pcolormesh(gx, gx, img[:-1, :-1])
      fig.colorbar(mesh)
  
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 24 for calling a global function with example usage: test_constrained_layout20() without return types