code: def test_twin_axes_empty_and_removed():
      # Purely cosmetic font changes (avoid overlap)
      mpl.rcParams.update(
          {"font.size": 8, "xtick.labelsize": 8, "ytick.labelsize": 8}
      )
      generators = ["twinx", "twiny", "twin"]
      modifiers = [
          "",
          "host invisible",
          "twin removed",
          "twin invisible",
          "twin removed\nhost invisible",
      ]
      # Unmodified host subplot at the beginning for reference
      h = host_subplot(len(modifiers) + 1, len(generators), 2)
      h.text(
          0.5,
          0.5,
          "host_subplot",
          horizontalalignment="center",
          verticalalignment="center",
      )
      # Host subplots with various modifications (twin*, visibility) applied
      for i, (mod, gen) in enumerate(
          product(modifiers, generators), len(generators) + 1
      ):
          h = host_subplot(len(modifiers) + 1, len(generators), i)
          t = getattr(h, gen)()
          if "twin invisible" in mod:
              t.axis[:].set_visible(False)
          if "twin removed" in mod:
              t.remove()
          if "host invisible" in mod:
              h.axis[:].set_visible(False)
          h.text(
              0.5,
              0.5,
              gen + ("\n" + mod if mod else ""),
              horizontalalignment="center",
              verticalalignment="center",
          )
      plt.subplots_adjust(wspace=0.5, hspace=1)
  
imports: from itertools import product
  import io
  import platform
  import matplotlib
  import matplotlib.pyplot
  import matplotlib.ticker
  from matplotlib import cbook
  from matplotlib.backend_bases import MouseEvent
  from matplotlib.colors import LogNorm
  from matplotlib.patches import Circle, Ellipse
  from matplotlib.transforms import Bbox, TransformedBbox
  from matplotlib.testing.decorators import check_figures_equal, image_comparison, remove_ticks_and_titles
  from mpl_toolkits.axes_grid1 import axes_size, host_subplot, make_axes_locatable, Grid, AxesGrid, ImageGrid
  from mpl_toolkits.axes_grid1.anchored_artists import AnchoredAuxTransformBox, AnchoredDrawingArea, AnchoredEllipse, AnchoredDirectionArrows, AnchoredSizeBar
  from mpl_toolkits.axes_grid1.axes_divider import Divider, HBoxDivider, make_axes_area_auto_adjustable, SubplotDivider, VBoxDivider
  from mpl_toolkits.axes_grid1.axes_rgb import RGBAxes
  from mpl_toolkits.axes_grid1.inset_locator import zoomed_inset_axes, mark_inset, inset_axes, BboxConnectorPatch, InsetPosition
  import mpl_toolkits.axes_grid1.mpl_axes
  import pytest
  import numpy
  from numpy.testing import assert_array_equal, assert_array_almost_equal
label_desc: Use image node_id 2 for calling a global function with example usage: test_twin_axes_empty_and_removed() without return types