code: def test_remove():
      fig, ax = plt.subplots()
      im = ax.imshow(np.arange(36).reshape(6, 6))
      (ln,) = ax.plot(range(5))
  
      assert fig.stale
      assert ax.stale
  
      fig.canvas.draw()
      assert not fig.stale
      assert not ax.stale
      assert not ln.stale
  
      assert im in ax._mouseover_set
      assert ln not in ax._mouseover_set
      assert im.axes is ax
  
      im.remove()
      ln.remove()
  
      for art in [im, ln]:
          assert art.axes is None
          assert art.figure is None
  
      assert im not in ax._mouseover_set
      assert fig.stale
      assert ax.stale
  
imports: import io
  from itertools import chain
  import numpy
  import pytest
  import matplotlib.colors
  import matplotlib.pyplot
  import matplotlib.patches
  import matplotlib.lines
  import matplotlib.path
  import matplotlib.transforms
  import matplotlib.collections
  import matplotlib.artist
  import matplotlib.backend_bases
  import matplotlib
  from matplotlib.testing.decorators import check_figures_equal, image_comparison
label_desc: Use image node_id 7 for calling a global function with example usage: test_remove() without return types