code: def test_constrained_layout1():
      """Test constrained_layout for a single subplot"""
      fig = plt.figure(layout="constrained")
      ax = fig.add_subplot()
      example_plot(ax, fontsize=24)
  
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 3 for calling a global function with example usage: test_constrained_layout1() without return types