code: def test_axis_margin(axis):
      margin = 50
      axis.margin = margin
      assert axis.margin == margin
      assert axis.GetMargins()[0] == margin
  
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 23 for calling a global function with example usage: test_axis_margin(axis) without return types