code: def test_axis_label(axis):
      label = "Y axis"
      axis.label = label
      assert axis.label == label
      assert axis.GetTitle() == label
  
      axis.label_visible = False
      assert not axis.label_visible
      assert not axis.GetTitleVisible()
  
imports: import itertools
  import platform
  import weakref
  import numpy
  import pytest
  from vtkmodules.vtkRenderingContext2D import vtkPen
  import pyvista
  from pyvista import examples
  from pyvista.plotting import charts
  from pyvista.plotting.colors import COLOR_SCHEMES
label_desc: Use image node_id 21 for calling a global function with example usage: test_axis_label(axis) without return types