code: def test_unpickle_canvas():
      fig = mfigure.Figure()
      assert fig.canvas is not None
      out = BytesIO()
      pickle.dump(fig, out)
      out.seek(0)
      fig2 = pickle.load(out)
      assert fig2.canvas is not None
  
imports: from io import BytesIO
  import ast
  import pickle
  import pickletools
  import numpy
  import pytest
  import matplotlib
  from matplotlib import cm
  from matplotlib.testing import subprocess_run_helper
  from matplotlib.testing.decorators import check_figures_equal
  from matplotlib.dates import rrulewrapper
  from matplotlib.lines import VertexSelector
  import matplotlib.pyplot
  import matplotlib.transforms
  import matplotlib.figure
  from mpl_toolkits.axes_grid1 import parasite_axes
label_desc: Use image node_id 16 for calling a global function with example usage: test_unpickle_canvas() without return types