code: def test_draw(backend):
      from matplotlib.figure import Figure
      from matplotlib.backends.backend_agg import FigureCanvas
  
      test_backend = pytest.importorskip(
          f"matplotlib.backends.backend_{backend}"
      )
      TestCanvas = test_backend.FigureCanvas
      fig_test = Figure(constrained_layout=True)
      TestCanvas(fig_test)
      axes_test = fig_test.subplots(2, 2)
  
      # defaults to FigureCanvasBase
      fig_agg = Figure(constrained_layout=True)
      # put a backends.backend_agg.FigureCanvas on it
      FigureCanvas(fig_agg)
      axes_agg = fig_agg.subplots(2, 2)
  
      init_pos = [ax.get_position() for ax in axes_test.ravel()]
  
      fig_test.canvas.draw()
      fig_agg.canvas.draw()
  
      layed_out_pos_test = [
          ax.get_position() for ax in axes_test.ravel()
      ]
      layed_out_pos_agg = [ax.get_position() for ax in axes_agg.ravel()]
  
      for init, placed in zip(init_pos, layed_out_pos_test):
          assert not np.allclose(init, placed, atol=0.005)
  
      for ref, test in zip(layed_out_pos_agg, layed_out_pos_test):
          np.testing.assert_allclose(ref, test, atol=0.005)
  
imports: import re
  from matplotlib import path, transforms
  from matplotlib.backend_bases import FigureCanvasBase, KeyEvent, LocationEvent, MouseButton, MouseEvent, NavigationToolbar2, RendererBase
  from matplotlib.backend_tools import RubberbandBase
  from matplotlib.figure import Figure
  from matplotlib.testing._markers import needs_pgf_xelatex
  import matplotlib.pyplot
  import numpy
  import pytest
label_desc: Use image node_id 14 for calling a global function with example usage: test_draw(backend) without return types