code: def test_contour_remove():
      ax = plt.figure().add_subplot()
      orig_children = ax.get_children()
      cs = ax.contour(np.arange(16).reshape((4, 4)))
      cs.clabel()
      assert ax.get_children() != orig_children
      cs.remove()
      assert ax.get_children() == orig_children
  
imports: import datetime
  import platform
  import re
  from unittest import mock
  import contourpy
  import numpy
  from numpy.testing import assert_array_almost_equal, assert_array_almost_equal_nulp, assert_array_equal
  import matplotlib
  from matplotlib import pyplot, rc_context, ticker
  from matplotlib.colors import LogNorm, same_color
  import matplotlib.patches
  from matplotlib.testing.decorators import check_figures_equal, image_comparison
  import pytest
label_desc: Use image node_id 42 for calling a global function with example usage: test_contour_remove() without return types